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masa =12 * 2 + 4 = 28u
sklad procentowy
28u=100%
24u=x%
x%=(100%*24u):28u
x%=2400:28≈86%-wegla
100%-86%=14%-wodoru
stosunek masowy
C= 2*12=24
H= 4*1=4
24:6
6:1