6.4 Hess’s Law
Hess's Law Problems
Calculate ΔH° for the following reaction.
3NO(g) → N2O(g) + NO2(g) ΔH°rxn = ?
| THERMODYNAMIC DATA | |
|---|---|
| 2NO(g) + O2(g) → 2NO2(g) | ΔH° = -113kJ |
| 2N2(g) + O2(g) → 2N2O(g) | ΔH° = +163kJ |
| N2(g) + O2(g) → 2NO(g) | ΔH° = +181kJ |
Calculate ΔH° for the following reaction.
C2H4(g) + 6F2(g) → 2CF4(g) + 4HF(g) ΔH°rxn = ?
| THERMODYNAMIC DATA | |
|---|---|
| H2(g) + F2(g) → 2HF(g) | ΔH° = -537kJ |
| C(s) + 2F2(g) → CF4(g) | ΔH° = -680kJ |
| 2C(s) + 2H2(g) → C2H4(g) | ΔH° = +52.3kJ |