Quantitative Chemistry: Avogadro's Constant 1 (DONE)

Question 1

What is Avogadro’s constant in standard form?

Answer 1

Avogadro’s constant in standard form is:

6.02 x 10↑23 (this is one mole)

(1 mole = 602000000000000000000000)

Question 2

Calculate the number of moles of atoms in one mole of water molecules.

H↓2O

Answer 2

H↓2O

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1 molecule of water contains 3 atoms.

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1 mole of water molecules contains 3 moles of atoms.

Question 3

Calculate the number of moles of atoms in one mole of methane molecules.

CH↓4

Answer 3

CH↓4

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1 molecule of methane contains 5 atoms.

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1 mole of methane molecules contains 5 moles of atoms.

Question 4

Calculate the number of moles of atoms in one mole of calcium hydroxide.

Ca(OH)↓2

Answer 4

Ca(OH)↓2

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1 molecule of calcium hydroxide contains 5 atoms.

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1 mole of calcium hydroxide molecules contains 5 moles of atoms.

Question 5

Calculate the number of atoms in one mole of hydrogen chloride.

HCl

Answer 5

HCl
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1 mole of hydrogen chloride contains Avogadro’s constant of molecules. In other words: 6.02 x 10↑23 molecules of hydrogen chloride.

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Since we have two atoms in hydrogen chloride (one hydrogen atom and one chlorine atom) we times Avogadro’s constant by two.

2 x 6.02 x 10↑23 atoms

1.204 x 10↑24 atoms

Question 6

Calculate the number of atoms in one mole of sodium oxide.

Na↓2O

Answer 6

Na↓2O
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1 mole of sodium oxide contains: 6.02 x 10↑23 molecules of sodium oxide.

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Since we have three atoms in sodium oxide we times Avogadro’s constant by three.

3 x 6.02 x 10↑23 atoms

= 1.806 x 10↑24 atoms in one mole of sodium oxide.