JEE Main 2025 Jan 24 Shift 1, Chemistry Q23: Properties of Carboxylic acids

JEE Main2025Jan 24, Shift 1Chemistry

$X$ g of benzoic acid on reaction with aq. NaHCO $_{3}$ release CO $_{2}$ that occupied 11.2 L volume at STP. $X$ is _____ g.

Your answer

Solution

The reaction is 1:1 in benzoic acid to CO $_{2}$ :

$C_{6} H_{5} COOH + NaHC O_{3} \to C_{6} H_{5} COONa + H_{2} O + C O_{2}$

Moles of CO $_{2}$ at STP: $n = \frac{11.2}{22.4} = 0.5$ mol.

Therefore moles of benzoic acid required $= 0.5$ mol.

Mass $= 0.5 \times 122 = 61$ g (molar mass of C $_{6}$ H $_{5}$ COOH $= 122$ g mol $^{- 1}$ ).

$∴$ Answer: $61$ .

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