Hess law and enthalpy change?

. Calculate the enthalpy change, DH4 for the reaction
C + 2H2 + O2 ® CH3OH DH4
using Hess’s Law and the following information.
CH3OH + O2 ® CO2 + 2H2O DH1 = -676 kJ mol-1
C + O2 ® CO2 DH2 = -394 kJ mol-1
H2 + O2 ® H2O DH3 = -242 kJ mol-1
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