Free Inorganic Chemistry Quiz | University Admission Chemistry Practice

Inorganic Chemistry

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The graph shows the percentage of ammonia in the equilibrium mixture for the Haber process, \[ \mathrm{N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)}, \] at different pressures and temperatures.

Which statement is fully supported by the graph and by chemical principles?

Select one option.

At 200 atm and \(450^\circ\text{C}\) the equilibrium yield is about 52%, and higher temperature increases the yield.
The yield falls as temperature rises, which shows that the forward reaction is endothermic.
At 200 atm and \(450^\circ\text{C}\) the yield is about 28%, and decreasing the pressure would increase the yield.
At 200 atm and \(450^\circ\text{C}\) the yield is about 13%, and an iron catalyst would raise this equilibrium yield.
At 200 atm and \(450^\circ\text{C}\) the yield is about 28%; the fall in yield with rising temperature shows that the forward reaction is exothermic, and about \(450^\circ\text{C}\) is used as a compromise because a lower temperature, although giving a higher yield, would make the rate uneconomically slow.

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