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A polymer contains 30% molecules with mo...

A polymer contains 30% molecules with molecular mass 20,000, 40% have 30,000 and rest have 60,000. Its `bar(M)n` is `36 xx 10^(x)`. What is x.

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The correct Answer is:
5
`bar(Mn) = (sum NiMi)/(sum Ni) = ((30 xx 20000) + (40 xx 30000) + (30 xx 60000))/(30+40+30) = 36000 = 36 xx 10^(3)`. So .x. is 3
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