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mC:mH=12:4=3:1
%C=12:16=75%
%H=4:16=25%
MCH3CH3=30g/mol
mC:mH=24:6=4:1
%C=24:30=80%
%H=6:30=20%
44u+12u=16u
wodor:
16u - 100%
4u - x %
16x - 400 /16
x=25%
wegiel:1
6u - 100%
12u - x
16x - 1200/16
x=75%