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Problem: Calculate the magnitude of the enthalpy change, and determine if the reaction is exothermic or endothermic for the following reaction: NH3 + 3F2 ⟶ NF3 + 3HFA. 870.9 kJ mol–1 , exothermic B. 870.9 kJ mol–1 , endothermic C. 1112 kJ mol–1 , exothermic D. 1112 kJ mol–1 , endothermic E. 290.3 kJ mol–1 , endothermic

FREE Expert Solution

We are asked to calculate the magnitude of the enthalpy change, and determine if the reaction is exothermic or endothermic for reaction. 

To calculate the ΔH°rxn using bond energies, we’re going to use the following equation:

ΔH°rxn = Hbond reactants - Hbond products


Let’s first figure out what kind of bonds and how many moles are present in each reactants and products because the given bond energies are per mole.

Balanced Reaction NH3 + 3F2 ⟶ NF3 + 3HF

*always make sure that the given reaction is balanced


Draw the structure of each compound.

Reactants:

 NH3:


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Problem Details

Calculate the magnitude of the enthalpy change, and determine if the reaction is exothermic or endothermic for the following reaction: NH3 + 3F2 ⟶ NF3 + 3HF

A. 870.9 kJ mol–1 , exothermic 

B. 870.9 kJ mol–1 , endothermic 

C. 1112 kJ mol–1 , exothermic 

D. 1112 kJ mol–1 , endothermic 

E. 290.3 kJ mol–1 , endothermic

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Bond Energy concept. If you need more Bond Energy practice, you can also practice Bond Energy practice problems.