For the reaction , H_(2)(g) + (1)/(2) O_(2)(g) rarr H_(2)(l),DeltaC_(p)=32 JK^(-1), DeltaHat 27^(@)C = - 285.8 kJ mol^(-1). What will be the value of DeltaHat 127^(@)C ?

For the reaction , H_(2)(g) + (1)/(2) O_(2)(g) rarr H_(2)(l),DeltaC_(p

1.	For the reaction , H_(2)(g) + (1)/(2) O_(2)(g) rarr H_(2)(l),DeltaC_(p)=32 JK^(-1), DeltaHat 27^(@)C = - 285.8 kJ mol^(-1). What will be the value of DeltaHat 127^(@)C ?
Answer» `- 289 . 0 kJ mol^(-1)` ` - 282 . 6 kJ mol^(-1)` ` -317 .0 kJ mol^(-1)` ` -253.8 kJ mol^(-1)` Solution :According to Kirchhoff's equation, `( DeltaH_(2) - DeltaH _(1))/(T_(2) - T_(1))= DeltaC_(p)` or `DeltaH_(2) - DeltaH _(1)= DeltaC_(p) ( T_(2) - T_(1))` or `DeltaH =DeltaH_(1)+ DeltaC_(p) ( T_(2)-T_(1))` `=- 285.8 + ( 32 XX 10^(-3)) ( 400- 300)` `=-282.6kJ mol^(-1)`