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Standard X

Chemistry

Molecular weight of polymers

If N 1, N 2, ...

Question

If $N_{1}, N_{2}, N_{3}, . . . . . .$ are the number of molecules with molecular masses $M_{1}, M_{2}, M_{3}, . . . . . .$ respectively, the mass average molecular mass is expressed as?

\frac{\sum N_{i} {M_{i}}^{2}}{\sum N_{i} M_{i}}

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\frac{\sum N_{i} M_{i}}{\sum N_{i}}

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\frac{\sum {M_{i}}^{2}}{\sum N_{i}}

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\frac{\sum N_{i} M_{i}}{\sum M_{i}}

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Solution

The correct option is A $\frac{\sum N_{i} {M_{i}}^{2}}{\sum N_{i} M_{i}}$
Mass average molecular mass = $\frac{\sum N_{i} {M_{i}}^{2}}{\sum N_{i} M_{i}}$

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Similar questions

Q. If

N_{1}, N_{2}, N_{3}, . . . . . .

are the number of molecules with molecular masses

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Q. If

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Q. Three perfect gases at absolute temperatures

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(l_{3}, m_{3}, n_{3})

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If $l_{1}, m_{1}, n_{1}, l_{2}, m_{2}, n_{2} a n d l_{3}, m_{3}, n_{3}$ are the direction cosines of three mutually perpendicular lines,then prove that the line whose direction cosines are proportional to $l_{1} + l_{2} + l_{3}, m_{1} + m_{2} + m_{3} a n d n_{1} + n_{2} + n_{3}$ makes equal angles with them.

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If N1,N2,N3,...... are the number of molecules with molecular masses M1,M2,M3,...... respectively, the mass average molecular mass is expressed as?

The correct option is A ∑NiMi2∑NiMiMass average molecular mass = ∑NiMi2∑NiMi

If $N_{1}, N_{2}, N_{3}, . . . . . .$ are the number of molecules with molecular masses $M_{1}, M_{2}, M_{3}, . . . . . .$ respectively, the mass average molecular mass is expressed as?

The correct option is A $\frac{\sum N_{i} {M_{i}}^{2}}{\sum N_{i} M_{i}}$
Mass average molecular mass = $\frac{\sum N_{i} {M_{i}}^{2}}{\sum N_{i} M_{i}}$