nCO2= 2.24/22.4=0.1 mol
2CH3COOH + CaCO3 --> (CH3COO)2Ca + CO2 + H2O
0.2___________________________________0.1
mCH3COOH=0.2*60=12g
mC2H5OH= 20-12=8 g
%CH3COOH= 12/20*100%=60%
%C2H5OH= 40%
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