1.

if enthalpies of formatuon of C_(2)H_(4)(g),CO_(2)(g) and H_(2)O(l)at 250^(@)and 1 atm pressure be 52 ,-394 and -286 kJ mol ^(-1) respectively,the enthalpy of combustion of C_(2) H_(4)(g)will be

Answer»

`1412 kJ MOL ^(-1)`
`-1412 kJ mol ^(-1)`
`+ 141 .2 kJ mol ^(-1)`
` -141 .2 kJ mol ^(-1)`

SOLUTION :`C_(2)H_(4)+3O_(2)to 2CO_(2)+2H_(2)O`
`DeltaH("REACTION")=[2xxDeltaH_(F)^(@)(CO_(2))+2xxDeltaH_(f)^(@)(H_(2)O)]`
`[DeltaH_(f)^(@)(C_(2)H_(4))+3xxDeltaH_(f)^(@)(O_(2))]`
`[2(-394)+2(286)]-[52+0]= 1412kJ mol^(-1)`


Discussion

No Comment Found

Related InterviewSolutions