Question

Consider these reactions, where M represents a generic metal.

1. 2M(s) + 6HCl(aq) ? 2MCl3(aq) + 3H�2(g) ?H1 = -868.0 kJ

2. HCl(g) ? HCl(aq) ?H2 = -74.8 kJ

3. H2(g) + Cl2(g) ? 2HCl(g) ?H3 = -1845.0 kJ

4. MCl3(s) ? MCl3(aq) ?H4 = -422.0 kJ

Use the information above to determine the enthalpy of the following reaction

2M(s) + 3Cl2(g) ? 2MCl3(s) ?H = __________ kJ