Finding the standard enthalpy of a reaction using enthalpies of atom combination

Question

Using the enthalpies of atom combination listed in the table to the right, calculate the standard enthalpy of the following reaction.

 

Substance     Enthalpy     

CH3OH(g)     -2037.11

O2(g)           -498.340

CO2(g)         -1608.531

H2O(g)         -926.29

 

2CH3OH(g)+3O2(g) -> 2CO2(g)+4H2O(g)

Answer 1

You need to use the Hess law to solve this problem. Essentially, you'd calculate the enthalpy for the products and subtract the enthalpy of the starting materials.