Homework Answers
for the given reaction 
H=40.7 kj/mol
which means, to vapourise 1 mol of H2O required heat = 40.7 kj/mol
mass of 1 mol H2O =18g
So we can say that 40.7 kj of heat is absorbed by 18g of H2O
therefore 2400 j = 2.4 kj will be absorbed by (18/40.7)*2.4= 1.061g of H2O
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