Ok, on this one I have no idea where to start. I could do all the homework ones, but have no clue even where to start on this. To me it seems backwards, but who knows. Here is the question:(adsbygoogle = window.adsbygoogle || []).push({});

Calculate the standard heat of formation of acetaldehyde, [tex]CH_{3}CHO[/tex] , given the following information:

[tex]CH_{3}CHO(g)+5/2O_{2}(g)\rightarrow2H_{2}0(l)+2CO_{2}(g)\triangle H=-1194kJ[/tex]

[tex]\triangle H{_f^\circ}~H_{2}O (g) [/tex] = -286 kJ/mol

[tex]\triangle H{_f^\circ}~CO_{2} (g)[/tex] = -394 kJ/mol

I'd show what I have so far, but honestly I have no idea what I am doing with this one.

Thanks for the help.

I'll probably have to end up redoing the LaTeX stuff because I can never seem to get it to work. It always says reload page in a moment in the preview.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Standard Heat of Formation Question

**Physics Forums | Science Articles, Homework Help, Discussion**