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Chemistry: The Central Science | 13th Edition | ISBN: 9780321910417 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward; Matthew E. Stoltzfus
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Solved: Bond Enthalpies (Section)Ammonia is produced

Chapter , Problem 73E

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QUESTION:

Bond Enthalpies (Section 8.8)

Ammonia is produced directly from nitrogen and hydrogen by using the Haber process, which is perhaps the most widely used industrial chemical reaction on Earth. The chemical reaction is

N2 (g) + 3H2 (g) ⟶ 2NH3 (g)

a) Use Table 8.4 to estimate the enthalpy change for the reaction. Is it exothermic or endothermic?

(b) Calculate the enthalpy change as obtained using ΔHf° values.

Questions & Answers

QUESTION:

Bond Enthalpies (Section 8.8)

Ammonia is produced directly from nitrogen and hydrogen by using the Haber process, which is perhaps the most widely used industrial chemical reaction on Earth. The chemical reaction is

N2 (g) + 3H2 (g) ⟶ 2NH3 (g)

a) Use Table 8.4 to estimate the enthalpy change for the reaction. Is it exothermic or endothermic?

(b) Calculate the enthalpy change as obtained using ΔHf° values.

ANSWER:

Step 1 of 3

a)

The given reaction is as follows;

                                 

Let’s calculate the bond enthalpy;

Bond enthalpy can be calculated by the following formula;

                            ..................(1)

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