Posted by olexandra on .
How to calculate enthalpy change of the following reaction? :
S + 2h2o >>> so2 + 2h2
given: s+o2 >>> so2  enthalpy change = 296.8 kJ
h2 + 1/2o2 >> h20 enthalpy change= 285.8kj
I was trying to solve it myself but i got confused.. i know i have to change the second equation to opposite side, but do i also multiply any of these equations by 2?
Thank you, I appreciate your help!

chemistry 
DrBob222,
Reverse equation 2 and multiply it by 2.