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What are your burning conditions? PE fibers are indeed only carbon and hydrogen. But don't forget that wool is a protein (main component keratin) fiber and does not only contain carbon, oxygen and hydrogen, but also sulpher. That will also have an influence on your smell ;) Whereas cotton is pure cellulose, if you do not have any waxes remaining.


For this question, you might ignore the difference between heat and entalphy, it really does not make a difference. The question basically asks you to find the most stable alkane of the ones listed. The reason for this is that they all burn to produce the same $\ce{CO_2 + H_2O}$, so the heat of combustion is larger if the initial molecular energy is lower. ...

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