JEE MAIN - Chemistry (2022 - 27th June Evening Shift - No. 15)
116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the following?
A. CH3COOH, B. HCHO, C. CH3OOCH3, D. CH3CHO
Answer
2
Explanation
$$
\begin{aligned}
&\% \mathrm{H}=\frac{7.5}{116} \times 100=6.5 \\\\
&\% \mathrm{O}=\frac{60}{116} \times 100=51.7 \\\\
&\% \mathrm{C}=\frac{48.5}{116} \times 100=41.8
\end{aligned}
$$
Relative atomicities $=\mathrm{H} \Rightarrow 6.5$
$$ \begin{aligned} &\mathrm{O} \Rightarrow \frac{51.7}{16}=3.25 \\\\ &\mathrm{C} \Rightarrow \frac{41.8}{12}=3.5 \end{aligned} $$
Emperically formula is approx.. $\mathrm{CH}_2 \mathrm{O}$
(A) $\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2$ (B) $\mathrm{CH}_2 \mathrm{O}$ relate to this formula.
Relative atomicities $=\mathrm{H} \Rightarrow 6.5$
$$ \begin{aligned} &\mathrm{O} \Rightarrow \frac{51.7}{16}=3.25 \\\\ &\mathrm{C} \Rightarrow \frac{41.8}{12}=3.5 \end{aligned} $$
Emperically formula is approx.. $\mathrm{CH}_2 \mathrm{O}$
(A) $\mathrm{C}_2 \mathrm{H}_4 \mathrm{O}_2$ (B) $\mathrm{CH}_2 \mathrm{O}$ relate to this formula.
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