# Chemistry

Calculate the amount of heat (in kJ) required to convert 87.5 g of water to steam at 100°C. (The molar heat of vaporizaion of water is 40.79 kJ/mol.)

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1. q=mass H2O x delta Hvap.

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posted by DrBob222
2. Calculate the amount of heat required to raise the temperature of a 31 sample of water from 9 to 26

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3. How much heat in Joules is needed to evaporate a cup of water (250g) at 100 degrees Celsius?

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posted by NB

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