(D) The number average molecular mass $(M_n)$ of a polymer is calculated using the formula: $M_n = \frac{\Sigma N_i M_i}{\Sigma N_i}$ Given: $N_1 = 15

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(D) The number average molecular mass $(M_n)$ of a polymer is calculated using the formula: $M_n = \frac{\Sigma N_i M_i}{\Sigma N_i}$ Given: $N_1 = 15, M_1 = 8,000$ $N_2 = 15, M_2 = 80,000$ Substituting the values: $M_n = \frac{15 \times 8,000 + 15 \times 80,000}{15 + 15}$ $M_n = \frac{120,000 + 1,200,000}{30}$ $M_n = \frac{1,320,000}{30} = 44,000$