Question

8. Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide.​

Answer 1

Explanation:

a.n=12/32=3/8

b.n=20/18=10/9

c.n=22/44=1/2

Answer 2

Answer:

a.12 g of oxygen gas has 0.375 moles.

b.Or molar mass of an element is equal to the molecular weight. i.e. one mole of water has a mass of 18g or it can also be said that 18g of water is contained in one mole of water. When 20g of water is converted, we get 1.11mol.

c.(Atomic masses : C=12u,O=16u) So, the mass of 1 mole of carbon dioxide is 44 grams. Thus, 22 grams of carbon dioxide are equal to 0.5 mole.