Chemistry - Mole Concept Question with Solution | TestHub

Molar mass of methane ($C{H}_4$) = $12+4\times 1=16{\text{ g mol}}^{-1}$

Number of moles of methane = $\frac{3.2}{16}=0.2\text{ mol}$

Number of molecules of methane = $0.2\times 6.022\times 10^{23}$

Number of electrons in one molecule of $C{H}_4$ = $6\text{ (from C)}+4\times 1\text{ (from H)}=10$

Total number of electrons = $0.2\times 6.022\times 10^{23}\times 10$

$=2\times 6.022\times 10^{23}=1.2044\times 10^{24}$

Answer: $1.204\times 10^{24}$