Complete combustion of X g of an organic compound gave 0.25 g of and 0.12 g of . If the % of carbon

Question

Complete combustion of X g of an organic compound gave 0.25 g of ${CO}_{2}$ and 0.12 g of $H_{2} O$ . If the % of carbon is 25% and of hydrogen is 4.89%, then X = _____ $\times 10^{- 3}$ g. (Nearest integer)

(Molar mass of C, H and O are 12, 1 and 16 g ${mol}^{- 1}$ respectively.) [2026]

Smart Achievers · Accepted Answer

(1)

$Moles of C O_{2} = \frac{Given mass}{Molar mass} = (\frac{0.25}{44}) mol$

$Moles of C in X g organic compound$

$= Moles of C O_{2} = (\frac{0.25}{44}) mol$

$Mass of C in organic compound$

$= moles of C \times molar mass of C = \frac{0.25}{44} \times 12 g$

$Mass percentage of C in organic compound$

$= \frac{0.25 \times 12}{44 X} \times 100 = 25, X = 0.2727 \approx 273 \times 10^{- 3} g$

Solution

Q.
Complete combustion of X g of an organic compound gave 0.25 g of ${CO}_{2}$ and 0.12 g of $H_{2} O$ . If the % of carbon is 25% and of hydrogen is 4.89%, then X = _____ $\times 10^{- 3}$ g. (Nearest integer)

(Molar mass of C, H and O are 12, 1 and 16 g ${mol}^{- 1}$ respectively.) [2026]

1 273

2 27

3 2730

4 227

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