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Use Hess's Law to calculate the enthalpy of reaction, ΔH rxn, for the reaction in bold...

Use Hess's Law to calculate the enthalpy of reaction, ΔH rxn, for the reaction in bold below given the following chemical steps and their respective enthalpy changes. Show ALL work!

2 C(s) + H2(g) → C2H2(g) ΔH°rxn = ?

1. C2H2(g) + 5/2 O2(g) → 2CO2 (g) + H2O (l) ΔH°rxn = -1299.6 kJ

2. C(s) + O2(g) → CO2 (g) ΔH°rxn = -393.5 kJ

3. H2(g) + ½ O2(g) → H2O (l) ΔH°rxn = -285.8 kJ

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