Select the most appropriate option. 6.24 g of ethanol are vaporized by supplying 5.89 kJ of heat. Enthalpy of vaporization of ethanol will be _______.

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KollegeApply · Accepted Answer

6.24 g of ethanol are vaporized by supplying 5.89 kJ of heat. Enthalpy of vaporization of ethanol will be 43.4 kJ mol–1. Explanation: Molar mass of ethanol (C2H5OH) = 46 g mol–1 Number of moles of ethanol = `"Mass of ethanol"/"Molar mass of ethanol" = (6.24 "g")/(46 "g mol"^-1)` = 0.1357 mol The enthalpy change when 0.1357 mol of ethanol vapourize is 5.89 kJ. ∴ Enthalpy change for 1 mole ethanol = (5.89 "kJ")/(0.1357 "mol") = 43.4 kJ mol-1

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