Q.
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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a
140 g mol−1
b
150.5 g mol−1
c
160 g mol−1
d
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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