The heat of formation of ammonia and hydrogen fluoride gas are (-46.1 mathrm{~kJ}) and -271.2 (mathrm{kJ}) respectively.

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The heat of formation of ammonia and hydrogen fluoride gas are \(-46.1 \mathrm{~kJ}\) and -271.2 \(\mathrm{kJ}\) respectively. Estimate the heat of the reaction

\[ 2 \mathrm{NH}_{3}(\mathrm{~g})+3 \mathrm{~F}_{2}(\mathrm{~g})=\mathrm{N}_{2}(\mathrm{~g})+6 \mathrm{HF}(\mathrm{g}) \]

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