Возьмем 100г в-ва
Значит
m(C) =82.75г
n(C)=82.75/12=6.89
w(H) =17.25%
m(H)=17.25г
n(H)=17.25 моль
n(C):n(H)=6,89:17.25
1:2.5
2:5
C2H5
