How many molecules are in 42.3g sample of water, H2O?

Answers

Answer 1

Answer: There are 14.152 molecules in 42.3 g sample of water, [tex]H_{2}O[/tex].

Explanation:

According to the mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{23}[/tex] atoms.

As mass of water (molar mass = 18 g/mol) is given as 42.3 g. Therefore, moles of water are as follows.

[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{42.3 g}{18 g/mol}\\= 2.35 mol[/tex]

Hence, molecules of water are calculated as follows.

[tex]2.35 \times 6.022 \times 10^{23} molecules\\= 14.152 molecules[/tex]

Thus, we can conclude that there are 14.152 molecules in 42.3 g sample of water, [tex]H_{2}O[/tex].


Related Questions

At STP, which of the following would have the same number of molecules at 1 L of C2H4 gas? Assume that each behaves as an ideal gas.
A. 0.5 L of H2 gas
B. 2 L of H2O gas
C. 1 L of Ne gas
D. 3 L of Cl2 gas

Answers

Answer: 1L of Ne gas

The answer is Option C , 1L of Ne gas will have the same number of molecules at 1 L of C₂H₄ gas

What is STP ?

At standard temperature and pressure, a system is said to have a temperature of zero degrees centigrade (273 Kelvins) and the pressure equal to the atmosphere is always 1 atm.

Additionally, one mole of any gas at STP occupies a volume of 22.414 L.

This concept only holds true for gases.

So for a gas having same pressure , temperature and moles according to the Ideal Gas Law , volume also needs to be same

                                       

                                           pV=nRT

and in the given option ,Option C has the same volume as that of 1 L of C₂H₄ gas .

To know more about STP

https://brainly.com/question/26107741

#SPJ2

Describe the three-dimensional property of an electromagnetic wave. Use the diagram below

Answers

Answer: The are waves that consist of vibrating electric and magnetic fields. They transmit energy through matter or across space. Some electromagnetic waves are generally harmless. Like other waves, electromagnetic waves have properties of speed, wavelength, and frequency.

Explanation:

what is chemical bonding?​

Answers

Answer:

Chemical bonding - a mutual adhesion of atoms in an molecule and the crystal lattice.

Explanation:

Hope you have a great day

what is electromagnetic?​

Answers

Electromagnetism is a branch of physics that involves the study of the electromagnetic force. It is a type of interaction that occurs between electrically charged particles.

Answer:

relating to the interrelation of electric currents or fields and magnetic fields.

Help meeeeee

A 280.0 sample of neon gas exerts a pressure of 660.0 mm Hg at 26.0°C. Assuming that the pressure remains constant, at what temperature in would the volume change to 440.0 ml?

Answers

Answer:

469.9K

Explanation:

Using Charles's law equation:

V1/T1 = V2/T2

Where;

V1 = initial volume (ml)

V2 = final volume (ml)

T1 = initial temperature (K)

T2 = final temperature (K)

Based on the information provided:

V1 = 280.0ml

V2 = 440.0 ml

T1 = 26.0°C = 26 + 273 = 299K

T2 = ?

Using V1/T1 = V2/T2

280/299 = 440/T2

0.936 = 440/T2

T2 = 440 ÷ 0.936

T2 = 469.9K

Which of the following is not a fossil fuel?

o copper
natural gas
O petroleum
O coal

Answers

Answer:

copper

Explanation:

coal, petroleum, and natural gas are all related to fossil fuels.

Copper is not a fossil fuel and the correct option is option 1.

What are fossil fuels?

Fossil fuels are compound mixtures made of fossilized plant and animal remnants from millions of years ago. The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure.

Fossil fuels are a non-renewable source of energy. Most of the energy used by us is obtained by the burning of fossil fuels. These fossil fuels are used up at a faster rate. They cannot be regrown at a scale compared to their consumption.

Therefore, Copper is not a fossil fuel and the correct option is option 1.

Learn more about Fossil fuels, here:

https://brainly.com/question/3371055

#SPJ2

Type the correct answer in each box.

Answers

Answer:

1 . 26

2. 55.854

Explanation:

because atomic number is the number of proton in other words smaller number and the mass number is the number of neutrons and electrons in other words bigger number .

hope this make sense :)

What is a jet stream. in your own words but be more detailed about what you say.
(don't send a link)

Answers

a narrow variable band of very strong predominantly westerly air currents encircling the globe several miles above the earth. There are typically two or three jet streams in each of the northern and southern hemispheres.

Find the total pressure (in atm) of a mixture that contains 3 gases with the following partial pressures. Gas A is 4.2atm, Gas B is 780 mmHg, Gas C is 250.00kPa

Answers

Answer: The total pressure of given mixture that contains 3 gases is 7.68 atm.

Explanation:

Given: Partial pressure of gases is:

Gas A = 4.2 atm

Gas B = 780 mm Hg

Convert mm Hg into atm is as follows.

[tex]1 mm Hg = 0.00131579 atm\\780 mm Hg = 780 mm Hg \times \frac{0.00131579 atm}{1 mm Hg}\\= 1.02 atm[/tex]

Gas C = 250 kPa

Convert kPa into atm as follows.

[tex]1 kPa = 0.00986923 atm\\250 kPa = 250 kPa \times \frac{0.00986923 atm}{1 kPa}\\= 2.46 atm[/tex]

Total pressure is the sum of partial pressures of gases present in the mixture.

Therefore, total pressure of given mixture is calculated as follows.

[tex]P_{total} = P_{A} + P_{B} + P_{C}\\= 4.2 atm + 1.02 atm + 2.46 atm\\= 7.68 atm[/tex]

Thus, we can conclude that the total pressure of given mixture that contains 3 gases is 7.68 atm.



How many pairs of electrons are shared by adjacent carbon atoms in an alkane?

Answers

Answer:

one

Explanation:

So, the number of pair of electrons are shared between two adjacent carbon atoms in a saturated hydrocarbon is 1

What will the volume be of 50 moles of helium at 25°C and 2.5 atm?​

Answers

The answer for this question would be 6 L

Consider the reaction.

2HF(g) +

H2(g) + F2(g)

At equilibrium at 600 K, the concentrations are as follows.

[HF] = 5.82 x 10-2 M

[H2] = 8.4 x 10-3M

[F2] = 8.4 x 10-3M

What is the value of Kea for the reaction expressed in scientific notation?

O 2.1 x 10-2

102.1 x 102

1.2 x 103

0 1.2 x 10-3

Answers

Answer:

0.021

Explanation:

Step 1: Write the balanced equation

2 HF(g) ⇄ H₂(g) + F₂(g)

Step 2: Calculate the value of the concentration equilibrium constant

The concentration equilibrium constant (K) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients.

K for this reaction is:

K = [H₂] × [F₂] / [HF]²

K = (8.4 × 10⁻³) × (8.4 × 10⁻³) / (5.82 × 10⁻²)² = 0.021

A salt is not composed of:
A. a metallic cation
B. non-metallic anion
C. an anion of a base
D. an anion of an acid

Answers

Answer:

B: non metalic anion if you try chemistry up salt is non metalic with metal things...

Explanation:

Does this help?

Would an alkali metal make a good replacement for tin in a tin can? Explain.

Answers

Answer:

No

Explanation:

If tin is heated, it can react with alkalis' with the release of hydrogen.

Tin is a great metal that is used for packaging purposes.

It does not react with any acid that may be present in the food material stored inside the tin can which makes it a useful metal. It keeps the food safe.

However, if the tin in the tin can is replaced with alkali metals then they will readily react with the acid present in the food materials stored inside, thereby rendering the food unsafe.

https://brainly.com/question/18153051

2 Iron(III) oxide (Fe2O3) is reduced by carbon on heating to give iron metal (Fe) and
carbon dioxide (CO2). (Ar values Fe 56, C 12,0 16)
When 480 g of Fe2O3 is heated with carbon, 336 g of Fe and 198 g of CO2 are produced.
Use the Law of Conservation of Mass to work out the mass of carbon that
reacted.
a

no links please i need this ASAP​

Answers

Using the law of conservation of mass, the mass of carbon reacted is 54 g of carbon.

What is the law of conservation of mass?

According to the law of conservation of mass, matter is neither created nor destroyed. This means that the total mass of reactants is equal to the total mass of products.

Total mass of the products = 336g + 198g = 534 g

Total mass of reactants = 480 g + x g

From the law of conservation of mass;  534 g = 480 g + x g

x g = 534 g - 480 g

x g = 54 g

Hence, 54 g of carbon reacted.

Learn more about law of conservation of mass: https://brainly.com/question/13383562

147.0 g piece of metal was heated to 155 C and added to a calorimeter containing 75.0 grams of water. The temperature of the water in the calorimeter was 23.5 C. After the metal was added, the temperature rose to 33.5 C. What is the specific heat of the metal?

Answers

65.9 is the heat of the metal

What change would shift the equilibrium system to the left?
A(g) + B(s) + Energy = 309) (3 points)
Adding more of gas C to the system
Heating the system
Increasing the volume
Removing some of gas C from the system

Answers

Answer:

C

Explanation:

sorry if its wrong but i think its right

Heating the system will shift the equilibrium system to the left.

The correct option is B.

What is equilibrium?

Chemical equilibrium is a state where no net change in the amounts of reactants and the products occurs during a reversible chemical reaction.

A reversible chemical reaction happens when the products react with the original reactants as soon as they are generated.

On a treadmill, you are walking continuously but not going anywhere, which can be said as equilibrium.

Thus, the correct option is B.

Learn more about equilibrium

https://brainly.com/question/13458865

HELP ASAP
In which reaction are the atoms of elements rearranged?

Answers

Explanation:

A physical change, such as a state change or dissolving, does not create a new substance, but a chemical change does.

In a chemical reaction, the atoms and molecules that interact with each other are called reactants.

In a chemical reaction, the atoms and molecules produced by the reaction are called products.

In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed.

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Answer:

It is B

Explanation:

The formation of water is a chemical reaction which rearranges atoms. The other reactions are nuclear reactions.

What mass of potassium would need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C? (cpotassium = 0.753 J/g°C)

Answers

Answer:

Explanation:

q = mCΔT

m =CΔT/q

ΔT = 57.8°C - 44.3°C = 13.5°C

m = (0.753*13.5)/2350

m = 0.00433 g

The mass of potassium that will need 2350 J of energy in order to raise its temperature from 44.3°C to 57.8°C is 231.17 g

Data obtained from the question Heat (Q) = 2350 JInitial temperature (T₁) = 44.3 °CFinal temperature of water (T₂) = 57.8 °CChange in temperature (ΔT) = 57.8 – 44.3 = 13.5 °C Specific heat capacity (C) = 0.753 J/gºC Mass (M) =?

Q = MCΔT

2350 = M × 0.753 × 13.5

2350 = M × 10.1655

Divide both side by 10.1655

M = 2350 / 10.1655

M = 231.17 g

Learn more about heat transfer:

https://brainly.com/question/6363778

#SPJ2

Titaium oxside is often added to food to color it white. If a jelly bean contains approximately 1.28x10-5 moles of TiO2, how many grams of TiO2 are in a jelly bean

Answers

Answer:

1.02 × 10⁻³ g

Explanation:

Step 1: Given data

Number of moles of titanium (IV) oxide in 1 jelly bean (n): 1.28 × 10⁻⁵ moles

Step 2: Calculate the mass (in grams) corresponding to 1.28 × 10⁻⁵ moles of TiO₂

To convert moles to mass, we need a conversion factor. In this case, it is the molar mass of TiO₂: 79.87 g/mol.

1.28 × 10⁻⁵ mol TiO₂ × 79.87 g TiO₂/1 mol TiO₂ = 1.02 × 10⁻³ g TiO₂

How many moles of NO are made from
mixing 7.2 moles of NH3 and 9.6 moles
of O? Identify the limiting reagent.

Answers

Answer:

216 g of NO

Explanation:

We begin from the reaction:

4NH₃ + 5O₂ →  4NO  + 6H₂O

We determine the limiting reactant with the moles of each reactant:

4 moles of ammonia react to 5 moles of oxygen

Our 7.2 moles of ammonia may react to (7.2 . 5) /4 = 9 moles

It's ok because we have 9.6 moles of oxygen. 0.6 moles still remain.

5 moles of oxygen react to 4 moles of NH₃

Our 9.6 moles of oxygen may react to (9.6 . 4) /5 = 7.68 moles

We only have 7.2 moles of NH₃ and we need 7.68; so there is no enough ammonia and that's our limiting reagent.

Now we determine the moles of product.

4 moles of ammonia can produce 4 moles of NO

Definetely our 7.2 moles, will produce 7.2 moles of oxide.

We convert to mass: 7.2 mol . 30 g/mol = 216 g

What is the percent by mass of carbon in carbon dioxide (CO2)?
A. 27%
B. 33%
C. 43%
D. 73%

Answers

The answer is going to be a.27

Describe and show an example of valence electrons. What is a common trend you can remember to help you understand valence electrons?

Answers

Explanation:

valency from right to left in a Periodic Table in same period first increases then decreases and from top to bottom it is same for a same group

5 difference between Ionic compound and covalent compound​

Answers

Answer:

Ionic compounds are formed by the transfer of electrons that are positively and negatively charged, whereas, covalent compounds are formed by sharing the electrons. 2. In an ionic compound, bonding involves a metal and nonmetal, whereas, in the covalent compound, bonding is between nonmetals

4. At what temperature will 5.00 g of Cl, exert a pressure of 900. torr at a volume of 750 ml?​

Answers

Answer:

p=27.8atm

Explanation:

P = 27.8atm

At what temperature will 5.00 g of Cl2 exert a pressure of 900. mmHg at a volume of 750.

How many protons, neutrons, and electrons are found in a neutral atom of hydrogen-333?

Answers

Answer:

Explanation:

A hydrogen atom has an atomic number of 1.

So it's proton number will always be 1.

A neutral hydrogen atom does not have any charge.

So it has the same amount of electrons as protons, which turns out to be also 1.

A neutral hydrogen atom has an atomic mass of ≈

1.00794 amu ≈ 1 amu.

To find the amount of neutrons, we take the proton number and subtract it from the mass number.

1 − 1 = 0

So a neutral hydrogen atom has no neutrons.

In summary,

A hydrogen atom has

1 proton

1 electron

0 neutrons

I hope that helps!

Help i’m taking a test!!
What new element is formed from the equation below? (Answer form is
MN:, AN: , S)

Answers

Answer:

Element Z

Explanation:

I hope this is correct and helps you!

what do electrons in the same shell have in common

Answers

Answer:

 They have the same amount of energy. They are all positively charged. They are all made up of atoms.

Answer:

they have the same quantity of energy...

Helpp me please answer fast

Answers

Answer: An element is a substance only containing atoms that have the same number of protons in the chemical nuclei

Explanation:

Identify two ways that temperature plays a role in chemical changes.

Answers

Answer:

Increasing the temperature will cause chemical changes to occur faster. Decreasing the temperature, causes the particles to lose energy which causes them to move around less and slower. The less they move, the less collisions occur, and the less reactions occur between the chemicals = slower reaction rate.

Explanation:

Other Questions
Which of the following led to the Formation of the 2nd Triumvirate?1. The Defeat of mark Antony and Cleopatra.2. The Slave Revolts On the Italian peninsula.3. The election of Julius Caesar as Dictator for life.4. The Assassination of Julius Caesar in the Roman Senate. Hello Please help me, I'll give brainliest! Rather than view waking in the middle of the night as a nuisance, people appear to have welcomed it asnatural, useful, and even enjoyable.las it is now What happens during a lunar eclipse?A Earth passes between the sun and the moon.B The moon passes between the sun and Earth.C The sun passes between Earth and the moon.D Earth, the sun, and the moon are at right angles in space. I can't find the right meaning. What is Castration and give me the types of castration 9. life forever with God for all who die in his friendship Orighteousnesseternal lifeconversion Please please help me :) PLEASE HELP NO SCAM (x+12) = 2 I finished sorting them out, if any of them are wrong pls tell me the letter(No link and dont solve them) The area of the shaded sector is shown. Find the radius of circle M. Round your answer to the nearest hundredth. SynonymsHelpHelpHelp Chad spent $28.80 at the supermarket. This was 36% of the cash he had in his wallet.Part 1: How much cash did Chad have before he paid his supermarket bill?Part 2: After shopping, Chad bought dinner for his family for $16.50. He gave the server a 16% tip. How much money did Chad have left? (Economics) I WILL GIVE BRAINLEST TO whoever answers it right!! How many grams would be in 1.752 x10^26 formula units of Ca(No3)2 What is the slope of the line connecting the points (2, 1) and (4, 5)? HELP! Will give branliest! A man sold two computers for Rs 24000 each on one negained 20% and on the other he lost 20%. find his gain oraspercentage of his whole transaction Change the following as indicated in brackets:1 Someone paid the bills.(Into Yes/no questions) MUSIC.Directions: Read the items carefully. Encircle the letter of the best answer.1. In the song "Magtanim ay Masaya", the musical phrase lahat ay masaya, should besung gradually from soft to loud. Which symbol is found above the musical phrase?A.C. ffB. mpD. P2. There are some parts of a song that need to be sung gradually becoming loud. Whichdynamics is used?A. decrescendo B. forteC. crescendoD. piano3. It is a dynamic mark in which the part of the song in line with the symbol will besung in a very loud manner. Which symbol is being referred to?A. pB. fC. ffD. pp4. Dynamics refers to the softness and loudness of a sound in music. Which of thefollowing is an example of dynamics?.B. #A.CD. mp5. It is a dynamic mark in which the part of a song in line with the symbol will be sungin a very soft manner. Which is the symbol being referred to?B. fC. ff6. It is a dynamic marking that means singing gradually from loud to soft.A. fortississimo B. decrescendo C. crescendoD. pianoA. PD. pp7. In the song "Ako ay Pilipino", the part taas noo kahit kanino should be sung in avery loud manner. Which dynamic marking means very loud?Bfc.ffD. pA. mpC. PD. f|8. The song "Tulog Na" is to be sung softly. Which musical symbol should be used?A. mfE9. Italian words and symbols are used to indicate dynamics. What is the Italian wordfor pp?A. pianoB. forte C. fortissimoD. pianissimo