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=30u
wyliczenia dotyczące węgla (C)
Mc=12u (g/mol)
2*12=24u
=80%
wyliczenia dotyczące wodoru (H)
Mh=1u(g/mol)
1*6=6u
=20%
mC2H6=2*12u+6*1u=30u
24u-x%
30u-100%
x=80%C
100%-80%=20%H