Chemistry - Mole Concept Question with Solution | TestHub

for formation of${\mathrm{N}}_2{\mathrm{O}}_3$
$2{\mathrm{N}}_2+3{\mathrm{O}}_2\to 2{\mathrm{N}}_2{\mathrm{O}}_3$
$2$moles of${\mathrm{N}}_2$combines with$3\mathrm{}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{e}$of${\mathrm{O}}_2$
Given,$7\mathrm{}\mathrm{g}\mathrm{m}$${\mathrm{N}}_2$$(80\mathrm{\%}\mathrm{}$only reacts$)$$\mathrm{i}.\mathrm{e}.\mathrm{}5.6$$\mathrm{g}\mathrm{m}$$\mathrm{o}\mathrm{f}$${\mathrm{N}}_2$
Mole of${\mathrm{N}}_2=\frac{5.6}{28}=0.2$
Hence$\frac{2}{0.2}=\frac{3}{\mathrm{x}\mathrm{}\mathrm{m}\mathrm{o}\mathrm{l}\mathrm{e}\mathrm{}\mathrm{o}\mathrm{f}{\mathrm{}\mathrm{O}}_2}$
$\mathrm{x}=0.3$moles
Number of atoms$=0.3\times 2\times 6.023\times 10^{23}$
$=3.61\times 10^{23}$