nCH2=C(CH3)-C(CH3)=CH2-------> --[--CH2-C(CH3)=C(CH3)-CH2-]n--
in reactiile de polimerizare, daca randamentul e 100%, masa de substanta care irezulta din reactieeste egala cu masa rezultata
m,polimer = 2000kg-teoretic
eta= m,practicax100/m,teor
60= mx100/2000=........................calculeaza m, in kg !
