217- Considering the reactions below, how many kilojoules of energy must be consumed to produce one kilogram of water vapor?
$$(O = 16,\ C = 12,\ H = 1 : \text{g.mol}^{-1})$$
$$C(\text{s, graphite}) + O_2(\text{g}) \rightarrow CO_2(\text{g}) \quad , \quad \Delta H = -394\text{ kJ}$$
$$CO(\text{g}) + \frac{1}{2}O_2(\text{g}) \rightarrow CO_2(\text{g}) \quad , \quad \Delta H = -283\text{ kJ}$$
$$2H_2(\text{g}) + O_2(\text{g}) \rightarrow 2H_2O(\text{g}) \quad , \quad \Delta H = -490\text{ kJ}$$
| (1) $11833$ | | (2) $14400$ |
| (3) $4446.7$ | | (4) $6745.2$ |