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M C2H4 =12*2 + 1*4= 24+4=28u
%C=24/28*100%=85,7%
%H=100%-84,7%=15,3%
%C = x
28u - 100%
24u - x
x = 24u/28u
24:28=86
%C = 85,7% ≈ 86%
%H = 100%-85,7% = 14,3% ≈ 14%