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A solution containing 12.5 g of non-elec...

A solution containing 12.5 g of non-electrolyte substance in 185 g of water shows boiling point elevation of 0.80 K. Calculate the molar mass of the substance. (`K_b=0.52 K kg mol^(-1)`)

A

`53.06 " g mol"^(-1)`

B

`25.3 " g mol"^(-1)`

C

`16.08 " g mol"^(-1)`

D

`43.95 " g mol"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
D
`M = (K_(b)xx W_(B))/(DeltaT_(b) xxW_(A))= (0.52 xx12.5)/(0.80 xx0.185)`
`= (52 xx 125)/(0.80 xx18.5) = 43. 92` g
(185 g = `0.185` Kg)
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