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I'm a little confused about how to employ Hess's Law.

Reaction A: Mg + 2HCl --> MgCl2 +

H2 ΔH= -469

Reaction B: MgO + 2HCl --> MgCl2 + H2O ΔH= -103

Reaction C: H2 + 1/2O2 --> H2O ΔH= -285

Reaction D: Mg + 1/2O2 --> MgO ΔH= ?

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Since, as we know that according to Hess's law enthalpy change will always be same whether a chemical reaction in a single... View the full answer

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