Question

calculate the no. of moles in the following
64g oxygen molecules
12g helium
20g of water​

Answer 1

Answer:

4 moles

3 moles

1.11 moles

Explanation:

Molar mass of oxygen is 16 grams. Therefore 64 gram oxygen = 64/16 = 4 mole oxygen

Molar mass of helium is 4 grams. Therefore 12 gram oxygen = 12/4 = 3 moles.

Molar mass of helium is 18 grams. Therefore 20 gram oxygen = 20/18 = 1.11 moles.