JEE MAIN - Chemistry (2021 - 25th July Evening Shift - No. 23)

When 3.00 g of a substance 'X' is dissolved in 100 g of CCl4, it raises the boiling point by 0.60 K. The molar mass of the substance 'X' is ______________ g mol$$-$$1. (Nearest integer).

[Given Kb for CCl4 is 5.0 K kg mol$$-$$1]
Answer
250

Explanation

$$\Delta$$Tb = Kb $$\times$$ molality

0.60 = 5 $$\times$$ $$\left( {{{3/M} \over {100/100}}} \right)$$

M = 250

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