CnH2nO2 => 14n+32
%O=mO/M*100 => 43,24=32/14n+32*100 => n=3
C3H6O2 -> acid propanoic
56x+100y=193
x/y=12/1 => x=12y=>x=3 moli
56*12y+100y=193 => y=0,25 moli
2CH3-CH2-COOH + CaO -> (CH3-CH2-COO)2Ca + H2O
2 moli C3H6O2...................1 mol CaO
x moli...................................3 moli CaO
x=6 moli
2CH3-CH2-COOH + CaCO3 -> (CH3-CH2-COO)2Ca + CO2 + H2O
2 moli C3H6O2...............1 mol CaCO3
x moli..............................0,25 moli CaCO3
x=0,5 moli
n total = 6+0,5=6,5 moli acid
Cm=n/Vs => Vs=n/Cm=6,5/2= Calculeaza !!!