Sry about this other question...

How can you find heat of formation if you're given a balanced chamical equation, but none of the heats of formation can be found on a table with common values. can it be found using hess's law?

for example:

CuSO_{4}+2KOH -> Cu(OH)_{2} + K_{2}SO_{4}

And the problem verbatim:

A 50.0 mL sample of a 1M solution of CuSO4 is mixed with 50.0 mL of 2M KOH in a calorimeter. THe temperature of both solution was 20.2C before mixing and 26.3C after mixing. The heat capacity of the calorimeter is 12.1 j/k. from these data, calculate delta H for the process (chemical eq given above). Assume the sp. heat and density of the solution after mixing are the same as those of pure water.

thank you very much for your help.