Question
What will be the mass of one ${ }^{12} C$ atom in g ?
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Answer
Since,
the number of atoms in 1 mol of ${ }^{12} C$ atoms $=6.022 \times 10^{23}$ atoms $=$ Atomic mass of carbon -12 in gms. $=12 g$ Thus, $6.0022 \times 10^{23}$ atoms of ${ }^{12} C$ have mass $=12 g$ $\therefore 1$ atom of ${ }^{12} C$ will have mass $=\frac{12}{6.022 \times 10^{23}} g$ $=1.9927 \times 10^{-23} g$
the number of atoms in 1 mol of ${ }^{12} C$ atoms $=6.022 \times 10^{23}$ atoms $=$ Atomic mass of carbon -12 in gms. $=12 g$ Thus, $6.0022 \times 10^{23}$ atoms of ${ }^{12} C$ have mass $=12 g$ $\therefore 1$ atom of ${ }^{12} C$ will have mass $=\frac{12}{6.022 \times 10^{23}} g$ $=1.9927 \times 10^{-23} g$
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