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Calculating Calories of Heat Produced

a) If 5.0 moles of H2 react, how many calories of heat are produced? (Using the bal equation: N2 + 3H2 -> 2NH3 + 21941 calories)

b) How many grams of H2 are needed to produce 55.0 grams of NH3?

c) Is this reaction endothermic or exothermic?

Solution Preview

Hello and thank you for posting your question to Brainmass.

a) From the equation we see that if 3 moles of H2 fully react, then we get 21941 calories.
So if 5 moles of H2 fully react, we get:

Q=5/3 * 21941 = 36568 Cal.

b) Again if we look at the species coefficients in the equation we see that if 3 moles of H2 fully react, we get 2 moles of ...

Solution Summary

The solution provides a detailed, step-by-step walk through of the calculations one must do to find the number of calories of heat produced from a hydrogen reaction, using the bai equation, as well as determining if the reaction is endo- or exothermic.

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