What is the mass

What is the mass of :
(a) 0.2 mole of oxygen atoms ?
(b) 0.5 mole of water molecules ?


(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 $=0.5 \times 18 \mathrm{~g}=9 \mathrm{~g}$

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