Question.
What is the mass of
(a) 1 mole of nitrogen atoms?
(b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?
(c) 10 moles of sodium sulphite $\left(\mathrm{Na}_{2} \mathrm{SO}_{3}\right)$ ?
What is the mass of
(a) 1 mole of nitrogen atoms?
(b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?
(c) 10 moles of sodium sulphite $\left(\mathrm{Na}_{2} \mathrm{SO}_{3}\right)$ ?
Solution:
(a) The mass of 1 mole of nitrogen atoms is $14 \mathrm{~g}$.
(b) The mass of 4 moles of aluminium atoms is $(4 \times 27) g=108 g$
(c) The mass of 10 moles of sodium sulphite $\left(\mathrm{Na}_{2} \mathrm{SO}_{3}\right)$ is $10 \times[2 \times 23+32+3 \times 16]\mathrm{g}$
$=10 \times 126 \mathrm{~g}=1260 \mathrm{~g}$
(a) The mass of 1 mole of nitrogen atoms is $14 \mathrm{~g}$.
(b) The mass of 4 moles of aluminium atoms is $(4 \times 27) g=108 g$
(c) The mass of 10 moles of sodium sulphite $\left(\mathrm{Na}_{2} \mathrm{SO}_{3}\right)$ is $10 \times[2 \times 23+32+3 \times 16]\mathrm{g}$
$=10 \times 126 \mathrm{~g}=1260 \mathrm{~g}$
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