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masa cz: 12+12+6=30g/mol
masa C: 24g
24/30 x 100%=80% węgla
eten C2H4
masa cz: 24+4=28g/mol
masa C:24g
24/28 x 100%=85,7% węgla
etyn C2H2
masa cz: 24+2=26g/mol
masa C:24g
24/26 x 100%=92,3%
1.etan
2.eten
3.etyn