You want to evaporate 400.0 g of water. Calculate the amount of heat needed
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You want to evaporate 400.0 g of water. Calculate the amount of heat needed

[From: ] [author: ] [Date: 13-05-20] [Hit: ]
4 kJ is equivalent to 902,400 J.......
Hv of water = 2256 j/g

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Assuming from the lack of other information,
the problem should have worded something like
"How much heat is needed to change 400.0g of water at 100° to steam at 100°"
To solve that problem, simply multiply:
400.0g x 2256J/g = 9,024E5J = 902.4kJ.

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902.4 kJ is equivalent to 902,400 J. *facepalm*

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