InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Heat of combustion `DeltaH^(@)` for `C(s),H_(2)(g)` and `CH_(4)(g)` are `94, -68` and `-213Kcal//mol` . Then `DeltaH^(@)` for `C(s)+2H_(2)(g)rarrDeltaCH_(4)(g)` isA. `-17` kcal/molB. `-111` kcal/molC. `-170 ` kcal/molD. `-85 ` kcal/mol |
|
Answer» Correct Answer - A For reaction `C(s) + 2H_(2)(g) to CH_(4)(g), DeltaH^(@)C=? ` `C+O_(2) to CO_(2), DeltaH=-94 ` kcal …(i) `2H_(2)+ O_(2) to 2H_(2)O, DeltaH=-68 xx 2` kcal …(ii) `CH_(4)+ 2O_(2) to CO_(2) + 2H_(2)O, DeltaH=-213` Kcal …(iii) On adding Eqs. (i) and (ii) and then subtracting Eq. (ii) `=(-94) + (-2xx68)-(-213)` `-230 + 213 =-17 `K cal/mol |
|