Avogadro's Constant 1"

Question 1

What is moles in standard form?

Answer 1

6.02 x 10^23.

Question 2

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

Answer 2

H2O
- 3 atoms.
1 molecule of water contains 3 atoms.
1 mole of water molecule contains 3 moles of atoms.

Question 3

Calculate the number of moles of atoms in one mole of Methane?

Answer 3

CH4

• 5 atoms.
• 1 molecule of Methane contains 5 atoms.
• 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?

Answer 4

Ca(OH)2:

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

Question 5

Calculate the number of ATOMS in one mole of hydrogen chloride?

Answer 5

HCl:

• 2 atoms.
• 2 x 6.02 x 10^23 atoms.

Question 6

Avogadro’s Constant 2: Calculate the number of atoms in 48g of magnesium.
Ar= 24.

Answer 6

Moles= mass/mr
moles= 48/24
= 2 moles.
2 x 6.02x 10^23

Question 7

Avogadro’s Constant 2: Calculate the number of atoms in 28g of lithium. Ar Li= 7.

Answer 7

Moles= 28/7
= 4 moles.
4 x 6.02 x 10^23

Question 8

Avogadro’s Constant 2: Calculate the number of atoms in 56g of calcium oxide.
Ar:
Ca= 40
O= 16

Answer 8

40 +16= 56
56/56= 1 mole.
1 x 6.02 x 10^23.