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Introduction to Le Chatelier's Principle

Predict the c...

Question

Predict the conditions for forward reaction on the basis of Le Chatelier's principle for :
$2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g)$ ; $Δ H = - 198 k J$

A

lowering the temperature and increasing pressure

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B

any value of temperature and pressure

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C

lowering of temperature as well as pressure

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D

increasing temperature as well as pressure

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Solution

The correct option is A lowering the temperature and increasing pressure
Option (A) is correct.
An increase in temperature favours endothermic reaction whereas an increase in pressure favours the reaction showing a decrease in mole or volume.
An increase in temperature is the result of the flow of heat into the system. In an endothermic reaction, an increase in temperature favours the reaction to occur in the forward direction reverse in case of exothermic.
When there is a decrease in pressure, the equilibrium will shift towards the side of the reaction with more moles of gas.

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Similar questions

Q. Consider the reaction :

2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g); △ H^{o} = - 198 k J

The favourable conditions for the forward reaction are:

Q. The variation of K and

K_{f}

K_{b}

with temperature shows the following effects:
(i) For endothermic reaction K increases and

K_{f}

K_{b}

also increases with temperature.
(ii) For endothermic reaction K decreases and

K_{f}

K_{b}

also decreases with temperature.
(iii) For exothermic reaction K decreases and

K_{f}

K_{b}

both increases with temperature.
(iv) For exothermic reaction K increases and

K_{f}

K_{b}

decreases with temperature.
(v) For exothermic reaction K decreases and

K_{f}

K_{b}

both decreases with temperature.

Q. In the reaction,

2 S O_{2} (g) + O_{2} (g) ⇌ 2 {S O}_{3} (g) + X c a l

most favourable conditions of temperature and pressure for greater yield of

{S O}_{2}

2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g)

Δ H = - X k J

is favoured by high pressure and high temperature.

Q. In the reaction,

2 S O_{2} (g) + O_{2} (g) ⇌ 2 S O_{3} (g) + X cal

, most favourable conditions of temperature and pressure for greater yield of

S O_{3}

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