Asked by Sarah

What is the value of q when 8.21g of water vaporizes at 373 K? The enthalpy of condensation of water at 373 K is -40.7 kJ/mol.

I tried using the equation q= m x Cs x Delta T, but I never got the right answer which is 18.5 kJ apparently, so I need to find out what I did wrong.
Answered by DrBob222
You used the correct formula for calculating q WITHIN a phase; however, the formula to use at a phase change is
q = mass x heat vap for boiling/condensing.
q = mass x heat fusion for freezing/melting.
Answered by Pop
git gud
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