Question
What will be the mass of one ${ }^{12} \mathrm{C}$ atom in g?
✓
Answer
1 mol of ${ }^{12} \mathrm{C}$ atom $=6.022 \times 10^{23}$ atom $=12 \mathrm{~g}$
Thus, $6.022 \times 10^{23}$ atoms of 12 C have mass $=12 \mathrm{~g}$
$\therefore 1$ atom of ${ }^{12} \mathrm{C}$ will have mass $=\frac{12}{6.022 \times 10^{23}}$
$\mathrm{g}=1.9927 \times 10^{-23} \mathrm{~g}$
Thus, $6.022 \times 10^{23}$ atoms of 12 C have mass $=12 \mathrm{~g}$
$\therefore 1$ atom of ${ }^{12} \mathrm{C}$ will have mass $=\frac{12}{6.022 \times 10^{23}}$
$\mathrm{g}=1.9927 \times 10^{-23} \mathrm{~g}$
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