Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: novusamor on April 04, 2009, 02:20:24 PM

Title: Homework Problem - Change in Enthalpy
Post by: novusamor on April 04, 2009, 02:20:24 PM

I have a question about the following problem:

H2 + 1/2 O2 -> H2O

Determine Delta H @ 110 degrees C

Possible thoughts were to use DeltaH = m*DeltaT*SH but there's hardly any given information.

It also seems like my professor wants us to use Hess's Law, but there's no table for reactions at 110 C.

Ideas?

Thanks.

Title: Re: Homework Problem - Change in Enthalpy
Post by: lancenti on April 07, 2009, 11:41:33 AM

The enthalpy change of the reaction, delta H Combustion, is constant. At 110 degrees C, however, not everything is in its standard state. Maybe you'll have to consider vaporization of one of the compounds? I don't know... maybe water since it boils at 100?