Question

What is the mass of

(i) 0.2 mole of oxygen atoms?

(ii) 0.5 mole of water molecules?

Answer 1

(i) Mass of 1 mole of oxygen atom = 16 u

Mass of 0.2 mole of oxygen atoms = (16 × 0.2) u = 3.2 u

(ii) Mass of 1 mole of H2O molecule = (1 × 2 + 16) = 18 u

Mass of 0.5 mole of H2O molecule = (18 × 0.5) u =9 u.

Answer 2

☢️ hi mate.......

☢️answer......

(i)we have.....

Mole of oxygen atoms:-0.2

molar mass of oxygen atom:-16g

so,

total mass of oxygen atom is:-

16×0.2=3.2g

(ii)we have.....

Mole of water molecules:-0.5

molar mass of water molecules:-2*(1)+16=18g

so,

total mass of water molecules is:-

18×0.5=9g