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mH= 1u
mC=12u
%mC= mC/mC2H4 * 100%
%mC= 2*12u/ 28u * 100%
%mC= 24u/ 28u * 100%
%mC= 85,71%
%mH= mH/mC2H4 * 100%
%mH= 1u*4/ 2* 12u+ 4*1u * 100%
%mH= 4u/ 28u *100%
%mH= 14,29%
Odp: Skład procentowy: 85,71% węgla oraz 14,29 % wodoru