How much heat is absorbed when 52.3 g #H_2O#(l) at 100 C and 101.3 kPa is converted to steam at 100 C? The molar heat of vaporization of water is 40.7 kJ/mol.

1 Answer
anor277
Jun 12, 2017

Approx. #+100*kJ#................

Explanation:

We assess the energy transfer involved in the reaction......

#H_2O(l) +DeltararrH_2O(g)#

Both the water and the steam are #100# #""^@C# in temperature.

We are given that #DeltaH_"vaporization"=40.7*kJ*mol^-1#.

And thus #Delta=(52.3*g)/(18.01*g*mol^-1)xx40.7*kJ*mol^-1=??kJ#

How would we change the answer if we were asked to assess the energy transfer when the same quantity of steam CONDENSED to give water at #100# #""^@C#?

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