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  4. A pure compound contains 2.4 g of C, 1.2 × 1023 atoms of H, 0.2 moles of oxygen atoms. Its empirical formula is

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Q. A pure compound contains $2.4\, g$ of $C$, $1.2 \times 10^{23}$ atoms of $H, 0.2$ moles of oxygen atoms. Its empirical formula is

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Solution:

Number of moles of $C =\frac{2.4}{12}=0.2$
Number of moles of $H =\frac{1.2 \times 10}{6.0 \times 10}=0.2$
Number of moles of $O =0.2 \,mol$
Empirical formula is $CHO$.