Question:
Which of the following contains maximum number of molecules?
(a) $1 \mathrm{~g} \mathrm{CO}_{2}$
(b) $1 \mathrm{~g} \mathrm{~N}_{2}$
(c) $1 \mathrm{~g} \mathrm{H}_{2}$
(d) $1 \mathrm{~g} \mathrm{CH}_{4}$.
Solution:
(c).
(a) $\frac{(1 \mathrm{~g})}{(44 \mathrm{~g})} \times \mathrm{N}_{\mathrm{A}}=0.023 \times \mathrm{N}_{\mathrm{A}}$
(b) $\frac{(1 \mathrm{~g})}{(28 \mathrm{~g})} \times \mathrm{N}_{\mathrm{A}}=0.036 \times \mathrm{N}_{\mathrm{A}}$
(c) $\frac{(1 g)}{(2 g)} \times N_{A}=0.5 \times N_{A}$
(d) $\frac{(1 \mathrm{~g})}{(16 \mathrm{~g})} \times \mathrm{N}_{\mathrm{A}}=0.063 \times \mathrm{N}_{\mathrm{A}}$
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