How Do You Calculate the Fraction of Ethylene in a Copolymer?

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To calculate the fraction of ethylene in a copolymer consisting of 62 wt% ethylene and 38 wt% propylene, the weight of each component is first determined by multiplying their molecular weights by their respective percentages. The calculations yield 17.39 for ethylene and 15.98 for propylene. The fraction of ethylene is then found by dividing the weight of ethylene by the total weight of both components, resulting in a formula of 17.39 divided by the sum of 15.98 and 17.39. This approach is correct for determining the fraction of ethylene mer in the copolymer. The final answer should be expressed to three decimal points.
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Heres a question I am stuck with

Crosslinked polymers consisting of 62 wt% ethylene and 38 wt% propylene may have elastic properties similar those for natural rubber. For a copolymer of this composition, determine the fraction of the ethylene mer.

Express your answer with three decimal points.


I honestly am lost with how to do this question...

What I did was...

Found the weight of ethylene (28.052) and the weight of propylene (42.078)...then multipled by the percentages and got...

28.052*0.62 = 17.39
42.078*0.38 = 15.98

then..

fraction = 17.39/(15.98+17.39)

I doubt this is right...any help would be much appreciated.

Thanks in advance!
 
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Sorry I think I posted this in the wrong section.

My apologies
 
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