If one mole of carbon atoms weighs 12 g , mass (in grams) of 1 atom of carbon ?

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3. ATOMS AND MOLECULES

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If one mole of carbon atoms weighs $12$ $g$, what is the mass (in grams) of $1$ atom of carbon ?

A

$0.99 \times 10^{-23}\,kg$

B

$0.99 \times 10^{-23}\,g$

C

$1.99 \times 10^{-23}\,g$

D

$1.99 \times 10^{-23}\,kg$

Solution

$1 \,mole$ carbon atom $=6.022 \times 10^{23}$ atoms

Molar atomic mass $=12\,g$

$6.022 \times 10^{23}$ carbon atoms weigh $=12\,g$

$1$ carbon atom weighs $\frac{{12}}{{6.022 \times {{10}^{23}}}}$ $=1.99 \times 10^{-23}\,g$

Standard 9

Science

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