Find the number of molecules present in 70 te | vedclass

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Question

(A) Step $1$: Calculate the molar mass of dinitrogen $(N_2)$. Molar mass of $N = 14 	ext{ g/mol}$, so molar mass of $N_2 = 2 	imes 14 = 28 	ext{ g/

Vedclass · Accepted Answer

$1.5055 	imes 10^{24}$

Vedclass · Answer

(A) Step $1$: Calculate the molar mass of dinitrogen $(N_2)$. Molar mass of $N = 14 	ext{ g/mol}$, so molar mass of $N_2 = 2 	imes 14 = 28 	ext{ g/mol}$.Step $2$: Calculate the number of moles $(n)$ in $70 	ext{ g}$ of $N_2$. $n = \frac{	ext{mass}}{	ext{molar mass}} = \frac{70 	ext{ g}}{28 	ext{ g/mol}} = 2.5 	ext{ mol}$.Step $3$: Calculate the number of molecules using Avogadro's number $(N_A = 6.022 	imes 10^{23} 	ext{ molecules/mol})$. Number of molecules = $n 	imes N_A = 2.5 	imes 6.022 	imes 10^{23} = 15.055 	imes 10^{23} = 1.5055 	imes 10^{24}$.

Find the number of molecules present in $70 \text{ g}$ of dinitrogen $(N_2)$.

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