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.(a) 10050(b) 17350(c) 26250(d) 35475The question was asked in an interview for job.My question is taken from Molecular Mass of Polymers topic in section Polymers of Chemistry – Class 12

Calculate the number average molecular mass of a polymer having four d

1.	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.(a) 10050(b) 17350(c) 26250(d) 35475The question was asked in an interview for job.My question is taken from Molecular Mass of Polymers topic in section Polymers of Chemistry – Class 12
Answer» Correct answer is (C) 26250 The best explanation: 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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