Chemistry Help?

1. Use standard heats of formation, H0f, to calculate the change in enthalpy for each

reaction.

a. C2H4 (g) + 3 O2 (g)2CO2 (g) + 2 H2O (l)

b. C6H6 (l) + 9/2 O2 (g)6CO (g) + 3 H2O (l)

c. Br2 (g)Br2 (l)

d. CaCO3 (s)CaO (s) + CO2 (g)

e. 2NO (g) + O2 (g)2NO2 (g)

f. 2C (s, graphite) + O2 (g)  2CO (g)

g. 2H2O2(l)2H2O(l)+O2 (g)

h. 4NH3 (g) + 5O2 (g)4NO (g) + 6H2O(g)

2. If the heat of formation in the chemical reaction below is −395.7 kJ/mol, how can the equation be rewritten to include the heat term? (Hint: watch the number of moles!)

                     S8 (s) + 12O2 (g) → 8SO3 (g)