Which of the following can be regarded as a favorable condition for ammonia synthesis (N₂ + 3H₂ ⇌ 2NH₃, ΔH < 0)?
Correct answer: D. Low T, high P
- A. High T
- B. Low P
- C. Low T, Low P
- D. Low T, high P
Explanation
.The reaction is exothermic, so low temperature favors the product. The reaction proceeds from 4 moles of gas to 2 moles, so high pressure favors the side with fewer moles (the product). Therefore, low temperature and high pressure are the favorable conditions.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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