Which of the following expressions represents the number average molar mass?

Which of the following expressions represents the number average molar mass?

A
$M = \frac{\sum N_{i} M_{i}^{2}}{\sum N_{i}}$
B
$M = \frac{Σ N_{i} M_{i}^{2}}{Σ N_{i} M_{i}}$
C
$M = \frac{\sum N_{i} M_{i}}{\sum N_{i}}$
D
$M = \frac{\sum N_{i} M_{i}}{\sum M_{i}}$

Solution:

Number average molar mass is defined as $M = Σ_{i} N_{i} M_{i} / Σ_{i} N_{i}$

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