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Ans.

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: Vapour pressure of pure Solvent vessel is diminished to 12 of its initial

An5- (1) Activation energy is defined as the energy (having energy less than the threshold energy) must gain in order to cross the

energy barrier and to change into the products.

Note: Activation energy cannot have zero or negative value.

pA = Vapour pressure of solution = 120.8 mm of Hg.

WB = Mass of solute = 1.5 3; WA = Mass of solvent = 250 g M A = Molecular Wt. of solvent = 78

M8 = Molecular Wt. of solute =

Putting the values in eqn. (1),

B " 250 Molecular wt. of the solute

Molecular wt. of the solute = 57 g/ mole. According to Lewis,

t can L-if ance tha Reaction co-ordinate

E Activation energy