In which of the following reactions the increase in pressure favors the reaction in the forward direction?
Correct answer: D. N2 + 3H2⇌ 2NH3
- A. H2 + I2 ⇌ 2HI
- B. N2 + O2⇌2NO
- C. PCl5⇌ PCl3 + Cl2
- D. N2 + 3H2⇌ 2NH3
Explanation
In the Haber process, which is represented by the reaction N2 + 3H2 ⇌ 2NH3, an increase in pressure favors the reaction in the forward direction. This reaction is an example of a synthesis reaction where ammonia (NH3) is produced from nitrogen (N2) and hydrogen (H2). According to Le Chatelier's principle, increasing the pressure will shift the equilibrium towards the side with fewer moles of gas. In this reaction, there are four moles of gas on the left side and only two moles of gas on the right side. Therefore, increasing the pressure will favor the formation of ammonia (NH3) to reduce the pressure.
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