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A solution containing 8g of a substanc...

A solution containing 8g of a substance in 100g a diethyl ether bolls at `36.86^@C`, whereas pure ether boils at `35.60^@C`. Determine the molecular mass of the solute (for ether `k_b`=2.02 K kg mol^-1)

A

387

B

374

C

3740

D

340

Text Solution

Verified by Experts

The correct Answer is:
B
8g of carbohydrate is present with 100g of water in solution or 108g solution contains 8g of carbohydrate,
`V_("Solution") =(108)/(1.025) xx 10^(-3)` litre
`pi = (n)/(V) xx R xx T`
`rArr (8)/(M ) xx (1.025)/(108) xx 1000x 0.0821 xx 30=5`, M= 374 g/mol
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