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nH=mH/MH=10,3/1 = 10,3mola
nO=mO/MO=27,6/16 = 1,725mola
nC : nH : nO = 5,175 : 10,3 : 1,725
nC : nH : nO = 3 : 6 : 1
mC₂H₅CHO=58u
C₂H₅CHO + H₂ --kat--> C₃H₇OH
58g aldehydu ---- 22,4dm³ wodoru
14,5g aldehydu --- xdm³ wodoru
x = 5,6dm³ wodoru