First slide

Lechatelier principle

Question

$2 B (g) ⇌ 3 C (l) + D (g) + 90 kJ,$ Favourable conditions for the formation of ‘B’ according to Lechatelier's principle are

Easy

A

Low temperature ; Low pressure
B

High temperature , High pressure
C

High temperature , Low pressure
D

Low temperature , High pressure

Solution

Forward reaction is exothermic, $ΔH = - 90 kJ$
It is favoured at low temperature
Forward reaction involves decrease in the moles of gaseous species
It is favoured at high pressure
Formation of ‘B’ is backward reaction ;
$∴$ Formation of B is favoured at high T, low P

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