InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
If one mole of ammonia and one mole of hydrogen chloride are mixed in a closed container to form ammonium chloride vapor, thenA. `Delta H = Delta U`B. `Delta H gt Delta U`C. `Delta H lt Delta U`D. there is no relationship |
|
Answer» Correct Answer - C Themochemical equation is `NH_(3) (g) + HCl (g) rarr NH_(4) Cl_(g)` Accroding to thermodynamics, `Delta H = Delta U + Delta n_(g) RT` where `Delta n_(g) = sum n_(P) (g) - sum n_(R ) (g)` `= (1) - (1 + 1)` `= -1` Since `Delta n_(g)` is negative `(lt 0)` we conclude that `Delta H lt Delta U` |
|