# How do you use Hess's Law to calculate the enthalpy change for the reaction?

##
#WO_3(s) + 3H_2(g) -> W(s) + 3H_2O(g)#

from the following equations:

#2W(s) + 3O_2(g) -> 2WO_3(s)#

#Delta H = -1685.4 kJ#

#2H_2(g) + O_2(g) -> 2H_2O(g)3#

#Delta H = -477.84 kJ#

from the following equations:

##### 1 Answer

Apr 16, 2016

Dividing the eq by 2 we have

Again

Multiplying this eq by

Adding Eq(1) with eq (2)