How Can the Temperature of Heat Energy from Water Formation Be Measured?

[Butterfly_grl]

If I have amount of hydrogen and Oxygen combined together after a reaction it will produce water and heat. How can I measure the temperature of this heat energy?

Now.I have
1) heat capacity (Cth) of H2 and O2.
2) the mass (m) of H2 and O2 combined together (in moles and grams)
3) Heat energy (Qth) of this process

I tried

Qth = m Cth + delta (tC)

but that just gives me the difference in temperature ...

Could you please explain if I have something missing and Could you illustrate with an example.

thanks

 

[Astronuc]

The reactants 2H₂ + O₂ combine to form the product 2H₂O. So one would need the heat capacity of H₂O.

What is the starting temperature of the H₂ and O₂?

Q = m c_P ∆T, where ∆T = T_f - T_i.