Chemistry - Mole Concept Question with Solution | TestHub

The number of moles $=\frac{\mathrm{Mass}}{\mathrm{Molar} \mathrm{mass}}$

The number of molecules $= \mathrm{moles}\times {\mathrm{N}}_{\mathrm{A}}$

One mole of any gas occupies $22.7 \mathrm{L}$ at STP.

(A) Moles of ${\mathrm{CH}}_4=\frac{16}{16}=1$
Molecules $=6.02\times {10}^{23}$
Electrons $=10\times 6.02\times {10}^{23}$
$=60.2\times {10}^{23}$

(B) Moles of ${\mathrm{H}}_2=\frac{1}{2}=0.5$ mole
Volume at STP $=\frac{1}{2}\times 22.7=11.35 \mathrm{lit}$ .

(C) 1 mole ${\mathrm{N}}_2=28\mathrm{gm}$

(D) $0.5$ mole ${\mathrm{SO}}_2=\frac{1}{2}\times 64=32\mathrm{gm}$