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JEE Main & Advanced JEE Main Online Paper (Held on 9 April 2013)

  • question_answer
                    If a polythene sample contains two monodisperse fractions in the ration 2: 3 with degree of polymerization 100 and 200, respectively, then its weight average molecular weight will be :                   JEE Main Online Paper (Held On 09 April 2013)

    A)                 4900                

    B)                                        4600                

    C)                 4300                      

    D)                        5200                

    Correct Answer: B

    Solution :

                    Weight average molecular weight                                   \[{{\overline{M}}_{w}}=\frac{{{W}_{1}}{{M}_{1}}+{{W}_{2}}{{M}_{2}}}{{{W}_{1}}+{{W}_{2}}}\]                


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