6. Consider the reaction: 2ClF3g) + 2NH3(g) arrow N2(g) + 6HF(g) + CI2(g) When c

Question

6. Consider the reaction: 2ClF3g) + 2NH3(g) arrow N2(g) + 6HF(g) + CI2(g) When calculating the triangle H degree rxn, why is the triangle H degree f for N2 not important? A) Because nitrogen is in its standard elemental state and no energy is needed for this product to exist. B) Because any element or compound in the gaseous state requires a negligible amount of energy to exist. C) Because the products are not included when calculating triangle H degree rxn. D) Because nitrogen is in its elemental state and does not contribute to the reaction itself. E) Two of the above statements explain why N2 is not important when calculating H degree rxn.

Explanation / Answer

When calculating the delta H reaction for the following reaction:

2ClF3 (g) + 2NH3 (g) ----à N2 (g) + 6HF (g) + Cl2 (g)

delta H = Hf products - Hf reactants

The delta H formation for N2 is not important for this reaction because nitrogen is in its standard elemental state and no energy is needed for this product to exist.

delta H formation for N2 = 0

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