Question

Describe the effect of addition of h2 , removal of nh3 , increasing pressure and increasing temperature on the equilibrium of the reaction : n2 + 3h2 gives 2nh3 .∆h = - 92 . 38 kj mol

Answer 1

N2 + 3 H2 ⇄ 2 NH3

In which direction—toward reactants or toward products—does the reaction shift if the equilibrium is stressed by each change?

H2 is added.

NH3 is added.

NH3 is removed.

Solution

If H2 is added, there is now more reactant, so the reaction will shift toward products to reduce the added H2.

If NH3 is added, there is now more product, so the reaction will shift toward reactants to reduce the added NH3.

If NH3 is removed, there is now less product, so the reaction will shift toward products to replace the product removed.

Test Yourself

Given this reaction at equilibrium:

CO(g) + Br2(g) ⇄ COBr2(g)

In which direction—toward reactants or toward products—does the reaction shift if the equilibrium is stressed by each change?

Br2 is removed.

COBr2 is added.

Answers

toward reactants

toward reactants

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