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【单选题】
溶解3.24g硫于40g苯中，苯的沸点升高0.81℃。若苯的Kb=2.53K·kg·mol-1，则溶液中硫的分子组成为( )。A.
S 2
B.
S 4
C.
S 6
D.
S 8
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A.
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A.
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B.
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A.
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