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masa cząsteczkowa polietylenu wynosi 560000n
-[CH2-CH2]-5000(indeks dolny) =m=1000*12u+2000*1u=12000u+2000u=14000u
mCH2=CH2=2*12u+4*1u=28u
n=560000/28u=20000 cząsteczek