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The vapour pressure of benzene at a certain temperature is 640 mm of Hg. When a nonvolatile and non-electrolyte solid weighing 2.175 g is added to 39.08 g of benzene, the vapour pressure of the solution becomes 600 mm of Hg. What is the molecular weight of solid substance?

(a) 69.60

(b) 49.59

(c) 59.60

(d) 108.30

1 Answer

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Best answer

Correct option (a) 69.60

Explanation:

Relative lowering of vapour pressure is given by :

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