Consider these reactions, where M represents a generic metal. 1. 2M (s) + 6HCl (

Question

Consider these reactions, where M represents a generic metal.

1. 2M (s) + 6HCl (aq) ---> 2MCl3(aq) + 3H2 (g)         delta H= -783 kJ

2. HCl (g) ---> HCl (aq)                                                    delta H= -74.8 kJ

3. H2 (g) + Cl2 (g) ---> 2HCl (g)                                     delta H= -1845 kJ

4. MCl3 (s) ---> Mcl3 (aq)                                               delta H= -195 kJ

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

2M (s) + 3Cl2 (g) ---> 2MCl3 (s)

deltaH=___________kJ

Explanation / Answer

We want this at the end.
2M (s) + 3Cl2 (g) ---> 2MCl3 (s)

We are given the equations for delta H's for the reaction.

1.2M (s) + 6HCl (aq) ---> 2MCl3(aq) + 3H2 (g) delta H= -783 kJ
2.HCl (g) ---> HCl (aq) delta H= -74.8 kJ

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