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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    A mixture of ethanol and \[CC{{l}_{4}}\] contain \[30\,%\]\[{{\operatorname{CCl}}_{4}}\] by weight. Mole fraction of \[CC{{l}_{4}}\] in the mixture is

    A)  0.99                

    B)  0.11

    C)  0.19                            

    D)  0.81

    Correct Answer: B

    Solution :

    Let us consider total mass of mixture is 100 g in which 30 g is \[CC{{l}_{4}}\] and 70 g is ethanol. \[\operatorname{Moles} of CC{{l}_{4}}\,\,=\,\,\frac{30}{154} =\,\,0.1948\] \[\operatorname{Moles} of ethanol =\,\,\frac{70}{46} = 1.52\] \[\operatorname{Mole} fraction of CC{{l}_{4}} =\,\,\frac{0.1948}{0.1948+1.52}\]\[=\,\,\,\,0.1136\]


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