To vaporize 1 g of water requires about 538 cal of heat, Ask an Expert

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To vaporize 1 g of water requires about 538 cal of heat interaction at 100 degrees C. The resulting vapor at 1 atm occupies a volume of 1674 cm^3. What fraction of the heat of vaporization represents the work needed to push back the atmosphere to make room for the vapour?

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