For water at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is .

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Question

For water  at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is  .

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Canvas Classes · Accepted Answer

Strategy:
 Relate the molar enthalpy of vaporization to the internal energy change using , assuming ideal behavior for the gas and negligible volume for the liquid.

Step 1: Parameters
Reaction: .
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Step 2: Calculation

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