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For the production of ammonia from its elements, 3H2(g)+N2(g)→2NH3(g), ΔH = -21.9 kcal. Part A: Is...

For the production of ammonia from its elements, 3H2(g)+N2(g)→2NH3(g),
ΔH = -21.9 kcal.

Part A: Is this process endothermic or exothermic?   

Part B: How many kilocalories are involved in the production of 27.75 g of NH3?

Part C: How many kilocalories are involved if 26.90 g of H2 are consumed in this reaction?

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