The percent yield of water vapor is 1000%, which is not possible and this is an indication that the experiment has not been done accurately or there is an error in the data, or the reaction is not a complete reaction.
To calculate the percent yield of a reaction, you need to know the theoretical yield (the maximum amount of product that could be produced based on the balanced equation) and the actual yield (the amount of product that was actually produced in the lab). To find the theoretical yield, you can use the balanced equation for the reaction and the amount of reactant that was used.
The balanced equation for the decomposition of iron(III) hydroxide is:
Fe(OH)3 --> Fe2O3 + H2O
We are given that 8.0 g of Fe(OH)3 was used in the reaction.
From the balanced equation, we can see that for every 1 mole of Fe(OH)3 that reacts, 1 mole of H2O is produced.
The molar mass of Fe(OH)3 is 106 g/mol
so the amount of moles of Fe(OH)3 is 8.0 g / 106 g/mol = 0.075 moles
The theoretical yield of H2O would then be 0.075 moles.
We also know that 0.75 L of H2O is isolated at STP, which is equivalent to 0.75 moles of H2O.
The percent yield can be calculated by dividing the actual yield by the theoretical yield, and multiplying by 100%.
% yield = (actual yield / theoretical yield) * 100%
% yield = (0.75 moles / 0.075 moles) * 100%
% yield = 10 * 100%
% yield = 1000%
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what are the two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances?
The two quantities in this module for which we will develop unit factors to do dimensional analysis with chemical substances are mass (m) and volume (V).
To calculate the unit factor, we need to divide the unit of the desired quantity by the unit of the given quantity. For example, to convert from mass to volume, the unit factor is V/m.
This unit factor can then be used to convert mass to volume or vice versa. Dimensional analysis helps us to determine the proper units for a given equation and to convert from one unit to another.
It also allows us to compare different units of measurement and to check that the units in both sides of an equation match. This is especially useful in chemical calculations, where it is important to ensure the correct units are used.
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A sample of an unknown substance contains 24. 0 grams of carbon and 2. 0 grams of hydrogen. A sample of another unknown substance contains 24. 0 grams of carbon and 6. 0 grams of hydrogen. Which law does this observation demonstrate
The law that demonstrates this observation is the law of definite proportions.
Law of definite proportion states that a given chemical compound continually incorporates its element factors in constant ratio (with the aid of using mass) and does now no longer rely on its supply and technique of preparation. Law of Definite Proportions states that during a given kind of chemical substance, the factors are continually blended withinside the identical proportions with the aid of using mass. The Law of Definite Proportions applies while factors are reacted collectively to shape the identical product. Such as , a sample of an unknown substance contains 24. 0 grams of carbon and 2. 0 grams of hydrogen.
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Carefully feel the sides of the flask. Is the crystallization of sodium acetate endothermic or exothermic? How do you know?
Answer:
It is not possible to determine whether the crystallization of sodium acetate is endothermic or exothermic simply by feeling the sides of the flask. To determine the heat of crystallization, you would need to measure the temperature of the solution before and after crystallization and compare the two values.
The heat of crystallization is defined as the heat absorbed or released during the process of crystal formation from a solution or a melt. If heat is absorbed during the process, the reaction is endothermic and the temperature of the solution or melt will decrease. If heat is released, the reaction is exothermic and the temperature will increase.
In the case of sodium acetate, it is an exothermic reaction, meaning that heat is released during crystallization and the temperature of the solution will increase. This is because the process of forming the crystal lattice requires the breaking of hydrogen bonds and other intermolecular forces, which releases energy.
Explanation:
Answer:
exothermic
Explanation:
When you crystallize the solution, sodium acetate forms a new bond from the soluble aqueous state ( Na+ and C2H3O2- ) to the solid state (NaC2H3O2). Forming bonds in chemistry is generally an exothermic reaction.
A principle of value stream mapping is to concentrate on speeding up value-added operations.
True/False
False. Value streaming mapping technique is used to analyze the flow of information, people and material required to bring a product to a consumer.
The value stream mapping is a series of steps. Value stream mapping provides a structured visualization of the key steps and corresponding data needed to understand and intelligently make improvements that optimize the entire process. Value stream is a series of steps that occur to provide the product or service that customers wants. Value stream mapping enables us to understand where the value is added, where it’s not and more importantly, how to improve upon the collective process.
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Tungsten 188 decays by beta. Find the daughter product.
daughter product (mass.atomic/,element symbol);
By beta, tungsten 188 decays. The mechanism through which an insecure atomic structure is produced is known as radioactive decay.
How does radioactive decay work?The process through which highly unstable molecular nucleus loses its energy through radiation is described as radioactive decay, also characterized as nuclear decay, radiography, radioactivity breakdown, or nuclear disintegration. A substance that has unstable nuclei is regarded as radioactive. For a large variety of human activities, radioactive decay is crucial.
What occurs when radioactive material decays?Alpha, beta, and/or gamma rays are all types of ionizing radiation that are released when radioactive atoms decay. Because the energy is powerful enough to dislodge firmly coupled electrons from just an atom's orbit, it is known as ionizing radiation. As a result, the atom develops into a charged ion.
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Solve the following equation for X. Remember to balance the equation. Xe + 2F2 -> X In the above question we see the reaction between Xe and fluorine gas F2. Interestingly, Xenon has a high affinity for oxygen, and xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> X + 6HF
xenon fluorides are known to undergo hydrolysis to give the hydrohalic acid and the rare gas oxide similar to the following equation: XeF6 + 3H2O -> XeO3 + 6HF.
A noble gas compound with the formula XeF6 is xenon hexafluoride. It is one of xenon's three binary fluorides, along with XeF2 and XeF4. All known are exergonic and stable at normal temperatures. The series' strongest fluorinating agent is XeF6.Water's chemical formula is H2O, which means that each of its molecules consists of two hydrogen atoms and one oxygen atom. In its +6 oxidation state, xenon can form the unstable chemical xenon trioxide(XeO3). It is an extremely potent oxidizing agent that slowly releases oxygen from water, a process that is sped up by sunshine. When it comes into touch with organic materials, it explodes dangerously. It emits xenon and oxygen gas when it explodes.
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What does 14 mean in c14?
14 mean in C14 is C14 has atomic mass of 14.
The radioactive carbon isotope with the longest half-life, carbon-14, whose decay enables precise dating of archaeological artifacts. Six protons and eight neutrons make up the carbon-14 nucleus, giving it an atomic mass of 14. Additionally, the isotope is employed as a tracer to monitor specific carbon atoms as they undergo chemical or biological changes.
The 14 in C14 represents the number of neutrons and protons in the nucleus of that atom or we can called it atomic mass. Carbon-14: with 6 protons and 8 neutrons, and an atomic mass of 14,
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How many ATP's is produced in the glycolysis of 2 glucose molecules?
Answer: 4 ATP molecules is produced in the glycolysis of 2 glucose molecules
How is ATP produced?The first stage of most carbohydrate catabolism, which is described as the breakdown of larger molecules into smaller ones, is glycolysis, which is a part of cellular respiration. Two Greek words that mean "to break down anything sweet" are the source of the word glycolysis. Two molecules of ATP are created during the breakdown of glucose and formation of pyruvate during glycolysis.
Explanation:
2 ATP are produced.
For every glucose molecule, meaning that for every 2 glucose molecules, 4 ATP will be created.
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Show all your work and make sure to label all the numbers with the correct units if you do, I will give you brainliest, 5 stars, and a thank you:
A: A sample of sulfuric acid has a mass of 15.0 g. How many molecules are in this sample?
B: How many moles of sulfuric acid are present in 45 g of this sample?
C: How much would a .750 mole sample of Ammonium sulfate weigh?
D: What is the mass percent of hydrogen in this sample?
In a typical IR spectrum, what name describes the units shown on the x-axis? a. wavenumber b. relative abundance c. %transmittance d. ppm e. intensity
In a typical IR spectrum, wavenumber name describes the units shown on the x-axis.
According to common understanding, IR includes wavelengths between the notional red edge of the visible spectrum, which is at a frequency of 430 THz, and 1 millimeter (300 GHz) (although the longer IR wavelengths are often designated rather as terahertz radiation ).The spatial frequency of a wave is measured in cycles per unit distance (common wavenumber) or radians per unit distance, and is also known as the wavenumber or repetency[1] (angular wavenumber).It is comparable to temporal frequency, which is determined by the quantity of radians or wave cycles per unit of time (ordinary frequency) (angular frequency).
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Why don't we draw a double bond between the Be and Cl atoms in the Lewis structure for BeCl2? a. That would give each Cl a positive formal charge and the Be a negative formal charge b. There aren't enough electrons in the molecule to do so. c. That would result in an expanded octet for beryllium.
d. That would result in an expanded octet for chlorine.
Lone electron pairs are absent from the Be atom. A negative formal charge would be placed on the Be atom as a result of the double bonds existing between it and the Cl atom.
Why is it necessary to go over the formal charges that each atom has in the Lewis diagram?When compared to an isolated neutral atom, the number of electrons that are attached to an atom in a molecule determines its formal charge.
Why is the octet rule broken by becl2?The octet rule is broken by B e C l 2, as the boron should be in a valence state that enables it to attach to three chlorines. However, in this molecule, the boron is joined by six electrons.
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Which of the following combinations could be linked together to form a nucleotide?
A) 1, 2, and 11
B) 3, 7, and 8
C) 5, 9, and 10
D) 11, 12, and 13
E) 12, 14, and 15
In order to produce a nucleotide, the combinations 11, 12, and 13 may be combined.
The definition and purpose of a nucleotideThe basic unit of DNA and RNA are nucleotides. Genetic material is present in them. Since many biological reactions involving enzymes require coenzymes, nucleotides serve in this capacity. ATP serves as the body's energy storage system.
How does DNA get made up of nucleotides?A phosphodiester bond forms when the 5' phosphate group of one nucleotide and the 3'-OH group of another nucleotide come together during the incorporation of nucleotides into DNA (see below). Phosphate-sugar-phosphate-sugar-phosphate forms the "backbone" of each DNA strand in this way.
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1. How many moles of propane are present at STP if the volume is 65.0 L? Please show all work
Answer:
Therefore, there are 4.47 moles of propane present at STP in a volume of 65.0 L
Explanation:
First, we need to calculate the number of moles of propane present at STP. At STP, the temperature is 273 K and the pressure is 1 atm.
Using the Ideal Gas Law, we can calculate the number of moles of propane present in the given volume.
PV = nRT
n = 4.47 mol
Therefore, there are 4.47 moles of propane present at STP in a volume of 65.0 L
F app F fric F norm F grav Which statement best describes the forces shown in this picture? A. The force of friction and the gravitational force are balanced. B. The force of friction is less than the applied force. C. The normal force and the gravitational force are balanced. D. All four forces are acting on the student.
He is not falling nor about to fall which means he’s perfectly balanced. So this means the force in the photo and friction in this photo is in a balanced condition, balancing the boy.
How forces are balanced?In the given picture, the applied force and the force of friction are balanced. if two forces act in the direction to make the object in a balanced state.
If the forces are in a balanced state it does not change the motion of the object, and if it is in an unbalanced state, it causes to change in the state of the motion.
Therefore, the force of friction and the gravitational force are balanced is the correct option.
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The given question is incomplete, so the complete question image is attached in the image below.
Explain the similarities and differences between putting a beaker of ethanoic acid in the refrigerator and mixing it with sodium carbonate. Use these words: chemical,physical, reversible, irreversible.
When a beaker of ethanoic acid is placed in the refrigerator and mix it with sodium carbonate, its temperature drops down and endothermic reaction take place.
[tex]2CH_{3} COOH + NaCO_{3}[/tex] ⇒ [tex]CH_{3}COONa + NaHCO_{3}[/tex]
This chemical reaction is a reversible reaction.
Similarities:Ethanoic acid and sodium carbonate combine to form an endothermic reaction that results in fizzing as carbon dioxide is released and heat is lost to the environment, making the reaction vessel feel chilly to the touch.
Differences:The difference between adding sodium carbonate to the solution and refrigerating ethanoic acid is that no new substance is created in the former. When the substance is taken out of the refrigerator, it is still ethanoic acid. New chemicals are created in the latter scenario. Because of a chemical process, the material is no longer ethanoic acid.
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CH4 + 2 Cl₂ →→ 4 HCl + C
4. Use the equation above to calculate how many moles of CH4 are required to
produce 3.6 moles of HCl. (2 pts)
By using given equation 0.9 moles of CH₄ are required to produce 3.6 moles of HCl.
In simple terms, what is a chemical reaction?The transformation of one or more reactants, also known as reactants, into one or more new products, also known as products, occurs during a chemical reaction.
Chemical reactions turn reactants into products by involving reactants in the process. As an illustration, when we breathe, oxygen is inhaled, and upon coming into contact with glucose, it reacts to create carbon dioxide, water, and energy.
Given chemical reaction:
CH₄ + 2 Cl₂ → 4 HCl + C
1 mole of CH₄ gives 4 moles of HCl
x moles of CH₄ gives 3.6 moles
x moles of CH₄ = 3.6/4
x moles of CH₄ = 0.9moles.
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1
4
2
What are the relative masses of a proton, neutron
and electron, given that a proton has a mass of 1?
How many protons, neutrons and electrons are
there in an atom of phosphorus, which has a proton
number of 15 and a mass number of 31?
3
Explain the terms atom and element, and include
a clear description of the relationship between the
two terms.
Explain why neutrons are important in making the
nucleus of an atom stable. You need to consider the
charges on the different subatomic particles present.
Answer:
Explanation:
A proton has a relative mass of 1. A neutron has a relative mass of 1. An electron has a relative mass of 1/1840. (accept 0)
An atom of phosphorus, which has a proton mass number of 31 has 15 protons, 15 electrons, and 16 neutrons.
Atom- The fundamental units of matter are atoms. They have a single nucleus, which is surrounded by a small number of protons and electrons.
Element- A species of atom known as an element is one that cannot decompose further. They only contain one kind of atom with the same quantity of protons.
Role of Neutron-
Neutron's charge is neutral. The element's mass is made up of protons and neutrons.
The neutrons' main function in an atom's nucleus is to contribute to the nuclear glue or binding energy that binds the nucleus itself together. Remember that protons and neutrons make up an atomic nucleus.
Positively charged protons don't get along with one another.
Neutrons are added to the structure to make up for the so-called mass deficit in order to counteract the protons' attractive forces.
In order to keep the nucleus together, the nucleons—the protons and neutrons in a nucleus—lose a little bit of mass that is transformed into binding energy.
Proton has relative mass of 1 while neutron has relative mass of 1. While that of an electron has relative mass of 1/1840.In phosphorous there are 15 electrons , protons and 16 neutrons.Atoms of same type combine to form element.Neutrons contribute to mass of atom hence change in number will make atom unstable.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
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calculate the solubility of AgCN in a solution containing 1.0M H Ksp of AgCN is 2.2e-12 Ka of HCN is 6.2e-10
The solubility of AgCN in a solution containing 1.0M H Ksp of AgCN is 2.2e-12 Ka of HCN is 6.2e-10 is 5.9 x 10^-2M.
Given concentration of H+ (M) = 1.0M
Ksp of AgCN = 2.2e-12
Ka of HCN = 6.2e-10
AgCN ⇋ Ag+ +CN− ................Ksp
CN − + H+ ⇋ HCN................... 1/Ka
AgCN + H+ ⇋ HCN + Ag+ ...................Ksp/Ka = K0
K0 = 2.2e-12/6.2e-10 = 0.0035 = 35 x 10-4
At Equilibrium: AgCN + H+ ⇋ HCN + Ag+
Let the moles of [Ag+] = x
So the number of moles of [HCN] = x
K0 = [Ag+] [HCN] / [H+]
35 x 10-4 = x^2/1
x = 5.9 x 10^-2M
Hence the molar solubility of AgCN in buffer solution is 5.9 x 10^-2M.
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A controlled experiment _____.Group of answer choicesIs repeated many times to ensure that the results are accurateProceeds at a slow pace to guarantee that the scientist can carefully observe all reactions and process all experimental dataIncludes at least two groups, one of which does not receive the experimental treatmentIncludes at least two groups, one differing from the other by two or more variables
An experimental group and a control group are both included in a controlled experiment. At least one of the two groups—the group that is not subjected to the experimental treatment—is present in a controlled experiment.
In controlled experiment, the researcher wants to determine how one or more variables affects on something. Since many different variables affecting the results, and most of them are not of interest to the researcher, and they will kept under control. They must remain constant. There must be at least of two groups. One of them is control group, and the other one is experimental group.
During experiment, a researcher compares between two groups. Both are composed of individuals which is coming from same population, so they are very identical in all the aspects except for independent variables that the researcher changes in to the experimental group and they observe that how they will affect the individuals. Control group is used to identify any of the other factors influencing the results which is obtained in the study, apart from the modified variables of the treatment. Independent variable keeps constant in control group.
The experimental group receives the treatment. The researcher voluntarily modifies the independent variable's values to see how it impacts the subjects. There can be several experimental groups.
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how many liters of water can be made from 55 grams of oxygen gas and an excess of hydrogen at a pressure of 12.4 atm
At a pressure of 12.4 atm and a temperature of 850 c, 8.2 liters of water can be created from 55 grams of oxygen gas and an excess of hydrogen.
first, we need the no.of moles of O2 = mass/molar mass of O2
= 55 g / 32 g/mol
= 1.72 mol
from the balanced equation of the reaction:
2H2 (g) + O2(g) → 2H2O(g)
we can see that the molar ratio between O2: H2O = 1: 2
So we can get the no.of moles of H2O = 2 * moles of O2
= 2 * 1.72 mol
= 3.44 mol
So by substitution by this value in the ideal gas formula:
PV = nRT
when P = 12.4 atm & n H2O = 3.44 mol & R= 0.0821 & T = 85 + 273=358K
12.4 atm *V = 3.44 * 0.0821 * 358 = 8.15 L
∴ V ≈ 8.2 L
In the physical sciences, pressure is defined as the perpendicular force per unit area or stress at a point within a confined fluid. The pressure exerted on a floor by a 42-pound box with a bottom area of 84 square inches is equal to the force divided by the area over which it is exerted, or one-half pound per square inch.
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Which sample contains the greatest number of molecules?
A 4g of hydrogen
B 18 g of water
C 24 dm³ of oxygen
D 66 g of carbon dioxide
And why is the answer that way?
Answer:
4g of hydrogen
Explanation:
4g of hydrogen (molar mass 2) corresponds to 2 moles of molecules or 4N number of atoms where N is the Avogadro's number (6.023×10
23)
Would using king size bags of M&M's make a difference to the average "atomic mass"? Why or why not?
No, because every M&M's is identical.
M&M's contain the same amount of protons, M&M's are the same hue. In other words, the size represents the various neutron counts.
Atoms of the same chemical element called isotopes each have a distinct mass number.
While isotopes can vary in mass, they never do so in atomic number (the amount of protons). You will use M&Ms to represent atoms because we are unable to see them. These objectives are use in M&Ms to determine the average atomic mass and to observe how different isotopes are.
In this the number show how many M&M's of that color and size are packed into that bags.
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An extremely efficient enzyme has a ____ KM and a ____ kcat.
An extremely efficient enzyme has a small KM and a large kcat.
The conversion rate at the lowest substrate concentration is measured in kcat/km. This interpretation is accurate. kcat/Km is a good indicator of an enzyme's effectiveness since it takes into account both the enzyme's maximum rate, kcat, and its affinity for its substrate (Km).The turnover number, or the number of molecules that may be created per second per active site, of an enzyme is provided by the formula k c a t / kM.Because the substrate concentration is almost usually much greater than the Km, in many situations, enzymes are only better when they have a larger kcat. It seems disingenuous to me to use the ratio when this is plainly the case, yet it still happens much too frequently. It could serve as a useful benchmark when compared to enzymes in particular situations.
complete question:An extremely efficient enzyme has a _____ KM and a _____ kcat.
A) small; small
B) small; large
C) large; large
D) large; small
E) kcat and KM do nothing to predict the efficiency of an enzyme
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Hydrogen bonds are an especially strong type of dipole-dipole interaction What are oil and water examples of
An exceptionally potent type of dipole-dipole interaction is hydrogen bonding. Oil and water are examples of the effects of hydrogen bonding.
Hydrogen bonding are a type of dipole-dipole interaction that occur between the hydrogen atoms of one molecule and the nitrogen or oxygen atoms of another molecule. They are relatively strong interactions, about 5-10% as strong as a covalent bond, and are responsible for the unique properties of many biological molecules, such as DNA and proteins. Oil and water are examples of substances that demonstrate the effects of hydrogen bonding. Water molecules are polar, meaning that they have a partial positive charge on the hydrogen atoms and a partial negative charge on the oxygen atoms. This polarity allows water molecules to form hydrogen bonds with one another, giving water its high surface tension and making it a good solvent for polar substances. Oil, on the other hand, is composed of non-polar molecules such as alkanes and alkenes, which do not form hydrogen bonds with one another. As a result, oil is immiscible with water and will float on top of it, because it does not have the same kind of attractive forces between its molecules as water does, and also the oil molecules have a low polarity. In summary, hydrogen bonds are a type of dipole-dipole interaction that are relatively strong, and oil and water are examples of substances that demonstrate the effects of hydrogen bonding. Water molecules can form hydrogen bonds with one another, giving it the properties of high surface tension and making it a good solvent for polar substances, while oil is composed of non-polar molecules and it is immiscible with water, having low polarity.
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How many total ATP are produced during glycolysis ?
During glycolysis, each G3P produces two ATP, for a total of four ATP per glucose molecule.
What is glycolysis?The metabolic mechanism that transforms glucose to pyruvate is known as glycolysis. This free energy is utilized to create the high-energy molecules adenosine triphosphate and reduced nicotinamide adenine dinucleotide. Glycolysis is a series of 10 enzyme-catalyzed processes. The initial stage in the breakdown of glucose to extract energy for cellular metabolism is glycolysis. Glycolysis is divided into two phases: energy-requiring and energy-releasing. Glycolysis is the process of breaking down glucose to create energy. It generates two pyruvate molecules, ATP, NADH, and water. The process occurs in a cell's cytoplasm and does not require oxygen. It can be found in aerobic and anaerobic organisms.
Here,
Each G3P produces two ATP during glycolysis, for a total of four ATP per glucose molecule.
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Base your answer on the choices below. (A) Pauli exclusion principle (B) Heisenberg uncertainty principle (C) Hund's rule (D) Wave nature of matter Which is responsible for interference patterns being exhibited by electrons
Wave nature of matter is responsible for interference pattern being exhibited by electrons.
Shortly after de Broglie proposed the wave nature of matter, two scientists at Bell Labs, C.J. showed experimentally that electrons can exhibit wave-like behavior. The wave-like motion of electrons is mathematically described by the so-called Bloch wave function. Named after his 20th-century physicist Felix Bloch, who first described the behavior of electrons in crystalline solids, these wavefunctions are complex. That is, it has both real and imaginary components.
These waves are called matter waves because electrons are a type of matter. Here,we relate the quantitative features of matter waves to familiar and measurable physical quantities such as energy, mass, and momentum.
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The statement "atoms have a small, dense nucleus" is true. What evidence do scientists use to prove this statement as true?
Most alpha particles shot at gold foil go straight through, without any changes in their direction.
The particles ejected in Thomson's experiment bent away from the negatively charged plates, but toward positively charged plates.
A few alpha particles shot at gold foil bounce in the opposite direction
No matter which element Thomson put in a cathode ray tube, the same negative particles with the same properties (such as charge and mass) were ejected.
To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. Therefore, the correct option is option C.
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.
The statement "atoms have a small, dense nucleus" is true. A few alpha particles shot at gold foil bounce in the opposite direction is the evidence.
Therefore, the correct option is option C.
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How many atoms of K are present in 195. 49 grams of K?
O 3. 0110 x 1024
O 6. 0220 x 1024
O 1. 1772 x 1026
0 4. 5797 x 1027
The number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
We are to determine the number of K atoms present in 195.49 grams of K.
First, we will determine the number of moles K present
number of moles =[tex]\frac{mass}{molar mass}[/tex]
Atomic mass of K = 39.0983 g/mol
Number of moles of K present = [tex]\frac{195.49}{39.09}[/tex]
Number of moles of K present = 4.99996 moles
Number of moles of K present ≅ 5 moles
Now, for the number of atoms present
From the formula
Number of atoms = Number of atoms × Avogadro's constant
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 5 × 6.022 × 10²³
Number of K atoms present = 30.11 × 10²³
Number of K atoms present = 3.0110 × 10²⁴ atoms
Hence, the number of K atoms present in 195.49 grams of K is 3.0110 × 10²⁴ atoms. The correct option is a 3.0110 x 10²⁴.
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what percent composition tell you about a molecule
Answer:
tells you by mass what percent of each element is present in a compound.
Explanation:
How can distance be measured?
Distance can be measured by centimeters (cm) and kilometers (km).
Distance is defined as the total movement of an object without any regard to the direction. Distance is the length of the route between the two points.
SI unit of distance is the meter (m). Short distances may be measured in the centimeters (cm), and the long distances may be measured in kilometers (km). For example: Measure the distance from the bottom to the top of a sheet of paper in centimeters and the distance from your house to your school. Maps are also used to measure the the distance.
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