Question.
What is the mass of :
(a) 0.2 mole of oxygen atoms ?
(b) 0.5 mole of water molecules ?
What is the mass of :
(a) 0.2 mole of oxygen atoms ?
(b) 0.5 mole of water molecules ?
Solution:
(a) Mass of one mole of oxygen atoms $=16 \mathrm{~g}$
mass of $0.2$ mole of oxygen atoms $=0.2 \times 16 \mathrm{~g}=3.2 \mathrm{~g}$
(b) Mass of one mole of water molecule $=18 \mathrm{~g}$
mass of $0.5$ mole of water molecules $=0.5 \times 18 \mathrm{~g}=9 \mathrm{~g}$
(a) Mass of one mole of oxygen atoms $=16 \mathrm{~g}$
mass of $0.2$ mole of oxygen atoms $=0.2 \times 16 \mathrm{~g}=3.2 \mathrm{~g}$
(b) Mass of one mole of water molecule $=18 \mathrm{~g}$
mass of $0.5$ mole of water molecules $=0.5 \times 18 \mathrm{~g}=9 \mathrm{~g}$