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What is w when 2.87 kg of H2O(l), initially at 25.0 ºC, is converted into water...

What is w when 2.87 kg of H2O(l), initially at 25.0 ºC, is converted into water vapour at 157 ºC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or "−" sign as appropriate.)

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