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IfN(1),N(2),N(3),……are the number of mol...

If`N_(1),N_(2),N_(3),……`are the number of molcules with molecular masses `M_(1),M_(2),(M_(3),…`respectively ,then mass average molar mass is expressed as:

A

`(N_(1)M_(1)^(2),N_(2)M_(2)^(2),+……)/((N_(1)M_(1),N_(2)M_(2),+……))=(SigmaNiMi^(2))/(SigmaNiMi)`

B

`(N_(1)M_(1),N_(2)M_(2),+……)/((N_(1),N_(2),+……))=(SigmaNiMi)/(SigmaNi)`

C

`(SigmaMi^(2))/(SigmaNi)`

D

`(SigmaNiMi)/(SigmaMi)`

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The correct Answer is:
a
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