MHT CET 2025 Chemistry question

Calculate the enthalpy of vaporisation of ethanol if 11.5 g of ethanol is completely vaporized by supplying 11.8 kJ of heat

(A)
(B)Correct
(C)
(D)

Answer: (B)

Solution

Molar mass of ethanol, = 2(12) + 6(1) + 16 = 46 g/mol. Moles vaporised = 11.5/46 = 0.25 mol. At constant pressure the heat supplied equals the enthalpy change,

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Question ID VK-101331