MCAT Question of the Day


  • Q:

    16g of an unknown, nondissociating substance is dissolved in 1kg of benzene. This solution is noted to boil at 75 degrees celsius, whereas pure benzene boils at 73 degrees Celsius. The ebullioscopic constant, Kb, is 2.5 degreesC*kg/mol. What is the molecular weight of the unknown substance?

     

    A

    15 g/mol

    B

    20 g/mol

    C

    25 g/mol

    D

    30 g/mol



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