NEET 2021 · ChemistryPrevious Year Question

An organic compound contains 78\% (by wt.) carbon and the remaining percentage of hydrogen. The empirical formula of the compound is [at. wt.: C = 12, H = 1]

Answer: (A) $CH X_{3}$ . \textbf{Answer:} (A) $CH X_{3}$ \textbf{Solution:} C: $\frac{78}{12} = 6.5$ mol; H: $\frac{22}{1} = 22$ mol.

A. $CH X_{3}$ ✓
B. $CH X_{4}$
C. $CH$
D. $CH X_{2}$

Correct Answer

(A) $CH X_{3}$

Solution & Explanation

\textbf{Answer:} (A) $CH X_{3}$ \textbf{Solution:} C: $\frac{78}{12} = 6.5$ mol; H: $\frac{22}{1} = 22$ mol. Divide by the smallest (6.5): C $= 1$ , H $= \frac{22}{6.5} \approx 3$ . Empirical formula $=$ $CH X_{3}$ .

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