Question: From the following enthalpy changes, C ( s ) + O 2 ( g ) C O 2 ( g ) , H = -

From the following enthalpy changes,
C(s)+O2(g)CO2(g),H=-393.5kJ
2H2(g)+12O2(g)H2O(l),H=-285.8kJ
CH4(g)+2O2(g)CO2(g)+2H2O(l),H=-890.3kJ
calculate the value of Hf for CH4.(3 marks for showing how to get to the overall reaction, stating the overall reaction since it isn't given, and the heat of reaction)
From the following enthalpy changes, C(s)+O2(g)CO2(g),H=-393.5kJ 2H2(g)+12O2(g)H2O(l),H=-285.8kJ CH4(g)+2O2(g)CO2(g)+2H2O(l),H=-890.3kJ calculate the value

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