[Blair12]

Determine ΔE° reaction for each of the following reactions. Report your answers to the nearest 0.1 kJ

2NH3(g)+3O2(g)+2CH4(g)-->2HCN(g)+6H2O(g)

2Al(s)+3Cl2(g)-->2AlCl3(s)

3NO2(g)+H2O(l)-->2HNO3(g)+NO(g)

I know the equation is: ΔH(reaction)= ΔE(reaction) +RTΔn(gases)

but that's as far as i've been able to get. Thanks for the help

[Enthalpy]

Welcome, Blair12!

I guess you have to find ΔH from tables and deduce ΔE.

As a sidenote, in RTΔn(gases) you implicitly suppose that the gases are perfect and the liquids and solids have a negligible volume. PV would be the more general definition.