Calculate the number of molecules of sulphur | vedclass

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Question

(B) Molar mass of sulphur $(S_8) = 32 	imes 8 = 256 \, g/mol$.Number of moles of $S_8$ in $16 \, g = \frac{	ext{Given mass}}{	ext{Molar mass}} = \f

Vedclass · Accepted Answer

$0.376 	imes 10^{23}$

Vedclass · Answer

(B) Molar mass of sulphur $(S_8) = 32 	imes 8 = 256 \, g/mol$.Number of moles of $S_8$ in $16 \, g = \frac{	ext{Given mass}}{	ext{Molar mass}} = \frac{16}{256} = 0.0625 \, mol$.Number of molecules = $	ext{Number of moles} 	imes 	ext{Avogadro constant} (N_A)$.Number of molecules = $0.0625 	imes 6.022 	imes 10^{23} = 3.76375 	imes 10^{22} \approx 3.76 	imes 10^{22}$ molecules.Wait,re-calculating: $0.0625 	imes 6.022 	imes 10^{23} = 0.376375 	imes 10^{23} = 3.76 	imes 10^{22}$.Correction: The provided option $3.76 	imes 10^{22}$ is not listed,but $3.76 	imes 10^{22}$ is $0.376 	imes 10^{23}$. Let us re-verify: $16/256 = 1/16 = 0.0625$. $0.0625 	imes 6.022 	imes 10^{23} = 0.376375 	imes 10^{23}$. Thus,the correct value is $0.376 	imes 10^{23}$.

Calculate the number of molecules of sulphur $(S_8)$ present in $16 \, g$ of solid sulphur.

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