Q.

A solution of 0.640 g of azulene in 100.0 g of benzene boils at 80.23oC. The boiling point of benzene is 80.10'C; the Kb is 2.53oC/molal. what is the molecular weight of azulene?

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a

108

b

99

c

125

d

134

answer is C.

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Detailed Solution

80.23−80.10=2.53×0.64/x100×103x=125
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