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If N1, N2, N3.......Ni, are the number o...

If `N_1, N_2, N_3.......N_i`, are the number of molecules with molecular masses `M_1, M_2, M_3......M_i` respectively, then the weight average molecular mass (MW) is expressed as

A

`(sum N_i M_i^2)/(sum N_i M_i)`

B

`(sum N_i M_i)/(sum N_i)`

C

`(sum N_i M_i^2)/(sum N_i)`

D

`(sum N_i M_i)/(sum M_i)`

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