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Calculation of enthalpy change (ΔH) for the reaction CH₄ + NH₃ → HCN + 3H₂ using Hess's Law with three provided thermochemical equations.

Handwritten chemistry problem calculating ΔH for the reaction CH₄(g) + NH₃(g) → HCN(g) + 3H₂(g), showing three given reactions with enthalpy changes and steps to manipulate them using Hess's Law.

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