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प्रश्न
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 _______.
विकल्प
43.4 kJ mol–1
60.2 kJ mol–1
38.9 kJ mol–1
20.4 kJ mol–1
उत्तर
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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