If N_1,N_2,N_3…….. Are the number of molecules with molecular mass – InterviewSolution

1.	If N_1,N_2,N_3…….. Are the number of molecules with molecular masses M_1,M_2,M_3………. Respectively, than mass average molecular mass is expressed:
Answer» `(sumN_iM_i^2)/(sumN_iM_i)` `(sumN_iM_i)/(sumN_i)` `(sumM_i^2)/(sumN_i)` `(sumN_iM_i^2)/(sumM_i)` ANSWER :A

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