32.2 gm of an organic compound containing C , H & O when completely combusted produces 61.6 gm of CO 2 and 37.8 gm of H 2 O . Based on this select the correct option -

Question

32.2 gm of an organic compound containing C , H & O when completely combusted produces 61.6 gm of CO 2 ​ and 37.8 gm of H 2 ​ O . Based on this select the correct option -

TestHub · Accepted Answer

Question Explanation: Analyzing combustion data to find the elemental composition of an organic compound.

Concept: Elemental analysis and percentage composition.

Solution: We use the masses of CO₂ and H₂O produced to find the masses of C and H in the original compound.

The mass of O is found by difference.

Mass of organic compound = $32.2 g m$ .

Mass of CO₂ = $61.6 g m$ .

Moles of C = $\frac{61.6}{44} = 1.4 m o l$ .

Mass of C = $16.8 g m$ .

Mass of H₂O = $37.8 g m$ .

Moles of H = $2 \times \frac{37.8}{18} = 4.2 m o l$ .

Mass of H = $4.2 g$ .

Mass of O = $32.2 - 16.8 - 4.2 = 11.2 g m$ .

A. $% C = \frac{16.8}{32.2} \times 100% \approx 52.17%$ . (Incorrect).

B. $% H = \frac{4.2}{32.2} \times 100% \approx 13.04%$ . (Correct).

C. $% O = \frac{11.2}{32.2} \times 100% \approx 34.78%$ . (Incorrect).

Final Answer: The correct option is (B).

Chemistry - Mole Concept Question with Solution | TestHub

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