Homework Help: chem

Posted by natash on Sunday, May 11, 2008 at 3:55am.

HOw much energy is required to heat 36.0g H2O from a liquid at 65C to a gas at 115C? The following physical data may be uselful.
Hvap=40.7kJ/mol
C liquid=4.18
C gas=2.01
C solid= 2.09
T melting=0 C
T boiling=100 C

The answers about 87.7 kJ

However I'm not sure how you get this,
so H=H heating liquid+H vap+H heating gas. I'm not getting the same answer

chem - DrBob222, Sunday, May 11, 2008 at 11:10am
q for liquid is mass x specific heat x delta T. or for gas is mass x specific hat gas x delta T.
q for phas change is mass x delta Hvap or delta H fusion
THEN add all.

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