Which of the following expressions is correct ? ( $n$ = number of moles of the gas, $N_{A}$ = Avogadro constant. $m$ = mass of 1 molecule of the gas. $N$ = number of molecules of the gas)

n = m N_{A}

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m = N_{A}

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N = n N_{A}

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N = m n / N_{A}

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Solution

The correct option is D $N = n N_{A}$
Number of molecules = Number of moles $\times$ Avogadro's Number
$∴$ $N = n N_{A}$

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