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If enthalpies of formation of C(2)H(4)(g...

If enthalpies of formation of `C_(2)H_(4)(g)1`,CO_(2) and`H_(2)O(l)` at`25(@)C` and`1`atm pressure be `52,-394`and`-286kJmol^(-1)`respectively ,the enthalpy of combustion of `C_(2)H_(4)(g)`will be

A

`- 141 .2 kJ// mol`

B

`-1412 kJ// mol`

C

`14.2 kJ// mol`

D

`+14.12 kJ// mol`

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If enthalpies of formation of C_(2)H_(4)(g)1 and H_(2)O(l) at 25(@)C and 1 atm pressure be 52,-394 and -286kJmol^(-1) respectively ,the enthalpy of combustion of C_(2)H_(4)(g) will be

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The standard enthalpy of formation of C_(2)H_(4)(l) , CO_(2)(g) and H_(2)O(l) are 52 , 394 and -286 kJ mol^(-1) respectively. Then the amount of heat evolved by burning 7g of C_(2)H_(4)(g) is

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