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When H2 (g) reacts with F2 (g) to form HF (g), 542 kJ of energy are...

When H2 (g) reacts with F2 (g) to form HF (g), 542 kJ of energy are evolved for each mole of H2 (g) that reacts.

Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation.
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