What exactly is heat of combustion? How would I calculate it?

1. Apr 1, 2009

black_hole

1. Calculate heat of combustion for butane. Given:

mass water- 129.91g
mass butane 0.15g
old temp- 16.4 degrees C
new temp.- 26.7 degrees C

2. Relevant equations

2C4H10 + 3O2 yields 8CO2 + 10H2O

3. The attempt at a solution

I've tried, but I really have no idea. I only know how to calculate q and apparently that's not the same.

2. Apr 1, 2009

Staff: Mentor

Heat of combustion is per mole, what you have calculated is for 0.15g...