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Calculate the number average molecular mass of a polymer having four different monomers A, B, C and D present in equal number. The molecular masses of the monomers are 10000, 15000, 30000 and 50000 respectively.

Calculate the number average molecular mass of a polymer having four different monomers A, B, C and D present in equal number. The molecular masses of the monomers are 10000, 15000, 30000 and 50000 respectively. Correct Answer 26250

Since the 4 monomers are present in equal amount, there is 25% of each monomer in the polymer. The number average molecular mass is, \(\Rightarrow\) Mn = (25×10000 + 25×15000 + 25×30000 + 25×50000)/(25+25+25+25) \(\Rightarrow\) Mn = (250000+375000+750000+1250000)/100 \(\Rightarrow\) Mn = 2625000/100 \(\Rightarrow\) Mn = 26250.

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