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(B) $1$. Calculate the molar mass of methane $(CH_4)$: $12 + 4 	imes 1 = 16 \ g/mol$. $2$. Calculate the number of moles in $3.2 \ g$ of $CH_4$: $n =

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$1.204 	imes 10^{24}$

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(B) $1$. Calculate the molar mass of methane $(CH_4)$: $12 + 4 	imes 1 = 16 \ g/mol$. $2$. Calculate the number of moles in $3.2 \ g$ of $CH_4$: $n = \frac{3.2 \ g}{16 \ g/mol} = 0.2 \ mol$. $3$. Calculate the number of molecules: $0.2 \ mol 	imes 6.022 	imes 10^{23} 	ext{ molecules/mol} = 1.2044 	imes 10^{23} 	ext{ molecules}$. $4$. Determine the number of electrons in one molecule of $CH_4$: Carbon has $6$ electrons and each Hydrogen has $1$ electron,so $6 + 4(1) = 10$ electrons per molecule. $5$. Calculate the total number of electrons: $1.2044 	imes 10^{23} 	ext{ molecules} 	imes 10 	ext{ electrons/molecule} = 1.2044 	imes 10^{24} 	ext{ electrons}$.

Column-$A$	Column-$B$
$1$. $55.55 \text{ mol}$	$(P)$ $6.022 \times 10^{23}$ molecules of sucrose
$2$. $2 \text{ mol}$	$(Q)$ $1.8 \text{ g}$ of $H_2O$
$3$. $0.1 \text{ mol}$	$(R)$ $126 \text{ g}$ of $HNO_3$
$4$. $0.01 \text{ mol}$	$(S)$ $1 \text{ L}$ of pure water

Find out the total number of electrons present in $3.2 \ g$ of methane $(CH_4)$?

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