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Question

What is U when 2.0 mole of liquid water vaporises at 100? The heat of vaporisation, H vap. of water at 100C is 40.66 kJ mol1


A
60
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B
75.11 
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C
88.2
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D
59 
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Solution

The correct option is C 75.11 
H2O(l)H2O(g)   :ng=1
for 2 moles
2H2O(l)2H2O(g)   :ng=2
U=Hng×RT=2×40.662×8.314×373×103=75.11 kJ 

Chemistry

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