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The vapour pressure of pure benzene at a...

The vapour pressure of pure benzene at a certanin temperature is `640 mm Hg`. A non-volatile, non-electrolyte solid weighing `2.175 g` is added to `39.0 g` of benzene. The vapour pressure of the solution is `600 mm Hg`. What is the molecular weight of the solid substance?

A

69.45

B

59.6

C

49.5

D

79.8

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The correct Answer is:
A
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