Calculate the molecular weight of a substance whose 7.0% by mass solution in water freezes at -0.93oC. The cryoscopic constant of water is 1.86oC kg mol-1:

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140 g mol−1

150.5 g mol−1

160 g mol−1

155 g mol−1

answer is B.

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Detailed Solution

0.93=1.86×7/x93/1000x=150.5 g mol−1

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