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Answer :
The amount of heat required to vaporize 100.0 g of ethanol at its boiling point is 83.78 kJ.
In order to calculate the amount of heat required to vaporize 100.0 g of ethanol at its boiling point, we can use the formula Q = n * ΔHv, where Q is the amount of heat required, n is the number of moles of ethanol, and ΔHv is the enthalpy of vaporization of ethanol.
To find the number of moles of ethanol in 100.0 g, we can divide the mass by the molar mass of ethanol, which is 46.07 g/mol:moles = mass / molar mass moles = 100.0 g / 46.07 g/mol moles = 2.172 mol.
Now we can use the formula Q = n * ΔHv to calculate the amount of heat required to vaporize 100.0 g of ethanol:Q = n * ΔHvQ = 2.172 mol * 38.6 kJ/molQ = 83.78 kJ.
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