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Calculate the enthalpy of formation of m...

Calculate the enthalpy of formation of methane from the following data.
`C_((s))+O_(2_((g)))toCO_(2)(g)DeltaH^(@)=-393.5kJ`…………..1
`H_(2_((g)))+1/2O_(2(g))toH_(2)O_((l))DeltaH^(@)=-285.8kJ`…………2
`CH_(4_((g)))+2O_(2_((g))) rarr CO_(2)(g)+2H_(2)O_((l))DeltaH^(@)=-890kJ`......................3

Text Solution

Verified by Experts

required thermochemical equation is
`C(S)+2H_(2)(g)toCH_(4)(g)DeltaH^((-))=?, C_((S))+2H_(2(g))toCH_(4(g))`
Eqn 1 as it is `C_((s))+O_(2(g))toCO_(2(g))DeltaH^((-))=-393//5kJ`
Eqn 2 `X^(2)` eqn Reverse Eqn 3
`2H_(2(g))+2/2O_(2)(g)to2H_(2((l)))DeltaH^((-))=571.6kJ`
`CO_(2(g))+2H_(2)O_((l))toCH_(4(g))+2O_(2(g))=-57kJ`
`DeltaH^((-1))=+890kJ`
`C_((s))+2H_(2(g)toCH_(4(g))DeltaH^((-))=-75kJ`
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