What is the enthalpy change for this reaction?

Explanation:

Hello,

In this case of thermochemistry, the first step is to know all the involved species' enthalpies of formation as shown below (extracted from the NIST database):

Now, for this particular chemical reaction and taking into account the involved stoichiometric coefficient, the feasible expression to compute the enthalpy change for that reaction is:

Best regards.

catya your not at all which answer i've seen you do this on another question!