Calculate the average atomic mass of chromium, given the following percent abundances and isotope masses: 4.350 % 49.946 amu; 83.790% 51.941 amu; 9.500% 52.941 amu and 2.360% 53.939 amu

A scuba diver's tank contains 1.47 moles of O₂ and 5.53 moles of He at the end of a dive. If the pressure of the gas mixture is 12.1 atm,  the partial pressure of He in the tank is 9.56 atm.

given that :

moles of  O₂ = 1.47 mol

moles of He = 5.53 mol

Total mole = 1.47 + 5.53 = 7 mol

mole fraction of He = mole of He / total moles

                                = 5.53 / 7

                                = 0.79 mol

Total pressure of gas mixture = 12.1 atm

partial pressure of He = mole fraction of He × total pressure

                                      = 0.79  × 12.1

                                      = 9.56 atm

Thus, A scuba diver's tank contains 1.47 moles of O₂ and 5.53 moles of He at the end of a dive. If the pressure of the gas mixture is 12.1 atm,  the partial pressure of He in the tank is 9.56 atm.

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Considering the definitions of atomic number and mass number, a radium atom has 138 neutrons.

First, an atom is defined as the smallest particle that can break down an element without losing the chemical properties that characterize it.

It consists of a positively charged central part, where almost all mass is concentrated to form the nucleus, and a certain number of negatively charged particles, electrons, which form the crust.

Atomic number, on the other hand, is denoted by the letter Z and indicates the total number of protons in the nucleus of a particular atom.

Finally, mass number is denoted by the letter A and indicates the sum of the number of protons and neutrons in the nucleus. The number of protons equals the atomic number,

In this case, the element radium has a mass number of 226 and an atomic number of 88.

so the mass number is

Mass number = (number of atoms) + (number of neutrons)

226= 88 + number of neutrons

226 - 88 = number of neutrons

138 = number of neutrons

therefore, a radium atom has 138 neutrons.

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The velocity of the whale is equal to 1.53 m/s.

Velocity can be defined as a vector measurement of the direction and position of an object. The velocity can be defined as the rate of change in the position w.r.t. time.

Velocity is a vector parameter as it possesses both magnitude and direction. A mathematical formula to determine velocity:

v = d / t

Where v is the velocity, d is the distance, and t is the time of an object.

The S.I. unit for velocity is meters per second (m/s) and can also express in miles/hour (mph), and kilometers/hour (kph).

Given the distance swum by the whale, d= 230 m

The time is taken by the whale, t = 2.5 min = 150 sec

The velocity of the whale = d/t = 230/150 = 1.53 m/s

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The precipitate usually forms nearer to the hydrochloric acid end of the tube because hydrogen chloride diffuses more slowly than ammonia.

This is because hydrogen chloride has almost twice the molecular weight of ammonia, and the rate of diffusion is inversely proportional to the square root of the molecular mass of the gas.

What happens when HCl reacts with ammonia?

Ammonia gas reacts with hydrogen chloride gas to produce ammonium chloride.

It is an acidic salt. Ammonium chloride is a weak base whereas HCl is a strong acid. When a weak base reacts with a strong acid, the base is unable to fully neutralize the acid.

What is observed when ammonia is tested with concentrated HCl?

When a glass rod dipped in hydrochloric acid is brought near a jar filled with ammonia, dense yellow fumes are observed.

Thus, when ammonia and HCL meet a yellow/white precipitate is formed neared to the hydrochloric acid end of the tube.

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13.A student determined the density of aluminum by taking average of the results of three density calculations. Each value was different, but average was equal to the accepted value for density of aluminum. The results of investigation are described as a.) accurate, but not precise.

The total number of protons and neutrons in an atom is known as the mass number. It is calculated by adding the number of neutrons and the number of protons together  .

14.Neutral atoms contain equal numbers of c.) protons and electrons.

15. An atom of potassium has 19 protons and 20 neutrons. Its mass number is d.) 39. As we know that, mass number = Number of protons + number of neutrons. Hence, 19 + 20 = 39

16.The isotope uranium-235 has 92 protons and 143 neutrons. Therefore, its mass number b.) 235.

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Answer:

CHEMICAL KINETICS can also be called as REACTION KINETICS.

CHEMICAL KINETICS is one of the branches of physical chemistry.

Explanation:

CHEMICAL KINETICS describes the speed of chemical species where they transform in new substances by breaking down. After breaking down they form molecular bonds.

Study of a chemical reaction can be stated as CHEMICAL KINETICS.

CHEMICAL KINETICS can be used in real life.

To know more about CHEMICAL KINETICS

The temperature of the solution decreases with the precipitation of solid lead nitrate in the solution.

Therefore, when a saturated solution of lead nitrate prepared at 50°C is cooled to 30°C solid lead nitrate is observed to segregate into the solution. This means that as the temperature decreases, so does the solubility of lead nitrate. The solubility of substances is directly affected by the temperature of the solvent.

The average kinetic energy of the molecules that make up the solution increases as the temperature of the solution increases. The increased kinetic energy allows solvent molecules to break down solute molecules bound by intermolecular interactions. A dissolution process is endothermic if the energy released when a water molecule bonds with a solute are less than the energy used to pull the solute apart.

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Answer: iron rusting and wood burning

Explanation: both can be considered physically changes

The no. of moles and mass of zn determines to be in the titration sample of zinc chloride be less than the original value. correct option is (A).

Percentage error = (experimental value / theoretical value) * 100

So experimental value is always less than that of the theoretical value

b. Higher mole of Cl than the true value

A smaller volume would lead to a smaller mol amount of Cl being calculated. Thus higher than the true value volume recording.

c. The ratio of zinc to chloride would decrease.

A higher number of Cl moles would lead to higher whole number when divided by the number of Zn moles. Thus, the ratio would have a larger denominator equals smaller ratio.

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No, I would not expect NO and NO2 to be stable molecules. This is because, in both the molecules, N has an incomplete octet. It has only 7 electrons in its outermost shell in both the molecules.

The primary exception to the Octet Rule is when there is a strange range of valence electrons. An instance of this will be Nitrogen (II) Oxide also called nitric oxide (NO. Nitrogen has five valence electrons whilst Oxygen has 6.

There are 3 trendy exceptions to the octet rule: Molecules, including NO, with an extraordinary range of electrons; Molecules wherein one or greater atoms own more than eight electrons, consisting of SF6; and. Molecules inclusive of BCl3, wherein one or extra atoms possess much less than 8 electrons.

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The separation compound using diffrence in boiling point melting point like physical properties.

What is physical properties?

A physical property is the any  measurable property that  whose value describes the state of a physical in  system. Changes in the  system's physical properties of  can be used to describe its transitions between the  momentary of state.

A physical property is a characteristic of the  matter that is not associated with in a  change in its chemicals composition. Familiar to the  examples of physical  properties that is include density, color, hardness, melting and boiling points, and the electrical conductivity.

There are mainly two types of physical property extensive and intensive.

Sol-The separation scheme to  used to separate the mixture of   based on differences in this  physical properties- such as boiling point, melting point, solubility in a given solvent these are the three components.

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A 3. 88 mol sample of gas has a temperature of 28 °C and a pressure of 885 torr.  its volume is 82.5 L.

Given that :

mole = 3.88 mol

temperature = 28 °C = 301 K

pressure = 885 torr = 1.16 atm

volume = ?

using the ideal gas equation , we get

P V = n R T

V = ( n RT) / P

V = (3.88 × 0.082 × 301 ) / 1.16

V = 82.5 L

Thus,  A 3. 88 mol sample of gas has a temperature of 28 °C and a pressure of 885 torr.  its volume is 82.5 L.

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Grams of nitrogen, N₂, are in a 5.00-liter container when the gas is under a pressure of 2.00 atmospheres at 50.0 °C is 5.640g

Gram is the unit of mass or weight that is used especially in the centimeter gram second system of measurement

Here given data is

Volume = 5.00-liter

Pressure = 2.00

Temprature = 50.0 °C = 50.0+273 = 323K

We have to calculate grams of nitrogen = ?

So, PV =nRT

PV = m/MRT

M = Molar mass of nitrogen gas = 28 g/mol

R = gas constant 62.3637LmmHgmol⁻¹K⁻¹

Then putting this value

PV = m/MRT

2.00×5.00 = m/28 × 62.3637 × 323K

10 = m/564.01

m = 5.640g

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The enthalpy of reaction can be obtained from;

ΔHf [tex]SO_{3}[/tex] - (ΔHf [tex]SO_{2}[/tex] + ΔHf [tex]O_{2}[/tex])

The enthalpy of formation has to do with heat that is evolved or absorbed when an object is formed from its constituents under standard conditions. In this case, we want to be able to obtain the enthalpies of formation of each of the substances in the reaction.

For [tex]SO_{2}[/tex]

[tex]S(s) + O_{2} (g) ------- > SO_{2} (g)[/tex]

For [tex]O_{2}[/tex]

[tex]O(g) + O(g) ----- > O_{2} (g)[/tex]

For [tex]SO_{3}[/tex]

[tex]SO_{2} (g) + \frac{1}{2} O_{2} (g) ----- > SO_{3} (g)[/tex]

Then if we now want to obtain the enthalpy of reaction, we know that we can be able to get it from;

Sum of formation enthalpy of the products - Sum of formation enthalpy of the reactants.

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The final pressure can be calculated using Boyle's law. The final pressure of the gas if the volume is increased from 3.98 L to 5.30 L is obtained as 526.4 mmHg.

Boyle's law states that at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas. Hence, volume decreases with increase in pressure and vice versa.

If P₁ and V₁ be the initial pressure and volume respectively and P₂, V₂ be their final quantities, then the relation between them can be written as:

P₁  V₁  =  P₂ V₂ .

It is given that the initial volume and pressure is 3.98 L and 701 mmHg, and the final volume is 5.30 L. Then, the final pressure is calculated as follows:

P₂ =  P₁  V₁ / V₂

    = (3.98  L × 701 mm Hg) / 5.30 L

    = 526.4 mmHg.

Hence, the final pressure of the gas will be 526.4 mmHg.

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Your question is incomplete, but your complete question probably was:

A sample of gas has an initial volume of 3.98 L at a pressure of 701 mmHg If the volume of the gas is increased to 5.30 L, what is the pressure? (Assume constant temperature.)

The absorbance is directly proportional to the concentration (c) of the solution of the sample used in the experiment.

What is beer-lambert law ?

The Beer-Lambert law is commonly used to measure sample absorbance and transmittance and can be used to determine sample concentration. In absorbance measurements, light passes through a cuvette filled with sample. Compare the light intensity after passing through the cuvette to the light before passing through the cuvette. The cuvette size determines the optical path length (L). (A cuvette is a special glass device.) The wider the cuvette, the more light of the sample is transmitted, and the less light is transmitted. This explains why the formula depends on the path length (L).

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Among the given pair of compounds, compound (I) is achiral and compound (II) is chiral.

A molecule is referred to as achiral if it has a plane of symmetry or a center of symmetry. A molecule is referred to as chiral if it lacks a plane of symmetry or a center of symmetry. Compound (I) is achiral because it possesses a plane of symmetry due to the presence of both OH groups at equatorial positions, which means they are on the same side of the cyclohexane ring. In compound (II) both OH groups are on the opposing side of the cyclohexane ring, there is neither a plane of symmetry nor a center of inversion so, it is chiral.

The question is incomplete. The complete question is attached as an image.

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Answer:

la respuesta es la a)

Explanation:

los enzimas son tipos de moléculas

Wegener use fossils evidence to the shapes of the continents as evidence that the continents had moved.

Chemical fossils are substances that may be discovered in rocks and serve as an organic record of prehistoric life. Chemical fossils can be divided into two categories: molecular fossils and isotope ratios. Molecular fossils are products of biological biosynthesis that are absorbed into sediments and subsequently into rock. They are also known as biomarkers or biosignatures.

Numerous of these molecules undergo well-known modifications and can remain stable for billions of years. Chemical fossils are found in fossil fuels such as petroleum (crude oil), coal, and natural gas, which are products of biological activity. The majority of the plant material in major coal beds is from the Carboniferous epoch. Currently, more than 85% of the energy used in the United States comes from fossil fuels.

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He proposed that matter, when small enough, reaches a point where it can no longer be divided and becomes atoms, meaning "individual".

Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible, and that they moved in infinite numbers through empty space until they stopped. In the philosophy of Democritus, atoms existed not only for matter, but also for such properties as perception and the human soul.

Democritus developed his atomic philosophy as a middle ground between the two opposing Greek theories of reality and the illusion of change. He argued that matter is divided into indivisible and immutable particles that create the appearance of change when they combine and separate from each other.

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Calcium chloride solution is a electrolyte solution.

An electrolyte solution is a solution that generally contains ions, atoms or molecules that have been lost or gained electrons during the reaction, and is electrically conductive. Because of this they are often called ionic solutions, however there are some cases where the electrolytes are not ions.

A non-electrolyte is a solute that does not dissociate, or which does not furnishes ions during the dissolving process. Therefore, solutions that are generated through the solvation of non-electrolytes do not contain ions and, instead they are called as neutral molecules.

In case of calcium chloride it is a electrolyte solution because when it dissociates it generated Ca2+ and Cl- ions, which gives a ionic solution. Hence it is a electrolyte.

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The partial pressure of the oxygen gas is obtained as 690.65 mmHg.

The term partial pressure has to do with pressure of a gas that is part of a mixture of gases. We know that the total pressure of a mixture of gases is the sum of the partial pressures of all the gases that we have in the mixture.

We know that we can be able to apply the Dalton's law of partial pressures in this case. From the Dalton's law of partial pressure we have that;

PT = PA + PB + PC + ...... These are the individual pressures of the gases.

Now we know that saturated vapor pressure of water at the temperature of 22°C  is 19.35 mmHg.

We can  now be able to obtain the pressure of the gas from the values that we have and this is;  710 mm-Hg - 19.35 mmHg = 690.65 mmHg

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The partial pressure of helium, He in the tank, given that the tank contains 1.47 mole of O₂ and 5.53 moles of He, is 9.559 atm

To calculate the partial pressure of He in the tank, we must first obtain the mole fraction of He. Details on how to obtain the mole fraction of He is shown below:

Mole fraction of He = Mole of He / total mole

Mole fraction of He = 5.53 / 7

Mole fraction of He = 0.79

Now, we can obtain the partial pressure of He. This is illustrated below:

Partial pressure = mole fraction × total pressure

Partial pressure of He = 0.79 × 12.1

Partial pressure of He = 9.559 atm

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Cyanide binds to the electron transport chain and prevents electron transfer to oxygen, preventing NADH from being converted to NAD+. This would imply that no ATP was also produced.

What is Cyanide?

Cyanide is a potentially lethal chemical that can exist in a variety of forms.

Cyanide can exist in the form of a colourless gas, such as hydrogen cyanide (HCN) or cyanogen chloride (CNCl), or as a crystal, such as sodium cyanide (NaCN) or potassium cyanide (KCN).

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What is Electron?

An electron is a negatively charged subatomic particle that can be bound to or free from an atom (not bound). A bound electron is one of the three primary types of particles within an atom, the other two being protons and neutrons.

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The following changes in oxidation number in the reaction.

NaI (aq) +  3HOCl (aq) → NaIO₃ (aq) + 3HCl (aq)

The iodine elements is going under oxidation in the given reaction that is from -1 to +5.

A loss of negatively charged electrons corresponds to an increase in oxidation number, while a gain of electrons corresponds to a decrease in oxidation number.

Therefore, the element or ion that is oxidized undergoes an increase in oxidation number.

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Answer:

zinc tetraoxosulphate (vi) solution was electrolysed in such a way that 0.5ampere flowed for 32minutes 10 was seconds deposing 0.325g of zinc at the cathode calculate:

on zoo_m

code :7201934829

pass : 1234

the number of moles of zinc deposited : the number of coulomb of electricity required to deposit 1mole of zinc: the charge on a zinc ion (1f=96500c,zn=65

In the attached Lewis electron-dot diagram of a molecule of ethyl methanoate, the hybridization of the valence electrons of the carbon atom labeled Cw is sp² hybridization.

The numerical value of the Hy-Cx-O bond angle is 109.5°

i. As we can see in the structure attached, the Cw carbon is making a double bond with oxygen. So it is an sp² hybridized carbon, the one unhybridized p orbital of Cw makes pi with the p orbital of oxygen.

ii. The numerical value of the Hy-Cx-O bond angle is 109.5°. As we can see the Cx is singly bonded with the oxygen and have sp³ hybridization, so the bond angle will be 109.5°.

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Considering the definition of isotopes and atomic mass of an element, the percent of each isotope is 16.5% abundant for Camerium-111 and 83.5% abundant for Camerium-113.

The same chemical element can be made up of different atoms, where their atomic numbers are the same, but the number of neutrons is different. Thus the isotopes of the element are formed.

The atomic mass of an element is the weighted average mass of its natural isotopes. This is, the atomic mass of a chemical element is usually calculated as the weighted average of the masses of the different isotopes of each element, considering the relative abundance of each of them.

In this case, you know:

Then, the average mass can be expressed as:

111x + 113×(1-x)= 112.67

Solving:

111x + 113×1 -113x= 112.67

111x + 113 -113x= 112.67

111x -113x= 112.67 -113

(-2)x= (-0.33)

x= (-0.33)÷(-2)

x=0.165= 16.5%

Finally, the percent of each isotope is:

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The possible alkynes with molecular formula C5H8 is 3.

C5H8 is Isoprene. The chemical name is Pentyne. This formula can also represent a monovalent functional group derived from any hydrocarbon having the formula C5H9 by removal of a hydrogen atom. or divalent radicals derived from C5H10 minus two hydrogen atoms;

The 3 alkynes are 1-Pentyne, 2-Pentyne, 3-Methyl-1-butyne or isopentyne.

Name of (ch3)2c(ch2ch3)ccch(ch3)2 is 5-ethyle-2,5-dimethyl-3-hexyne.

Name of brch2ch2c cch2ch3 is 1-bromohex-3-yne.

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It is the ratio of the distance traveled by a compound in a mobile phase compared with the distance traveled by the front of the mobile phase itself

What is Rf Value?

Rf = migration distance of substance / migration distance of solvent front

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