Multiply equation 1 by 2.
Add in equation 2.
Add in the reverse of equation 3.
When you multiply equations multiply dH also. When you reverse an equation, change the sign of dH.
Find the enthalpy change of the following reactions 2C+2H2O---> CO2+CH4
Using the following reactions with their change in H values.
C+H2O---->CO+H2 H=+131.1kjmol-1
Co+H2O---->CO2+H2. H=-41.2kjmol-1
CH4+H2O--->CO+3H2 H=15.3
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