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1cm3 --- 0.95g
2000cm3 -- x
x=2000*0.95/1=1900g
ze C% obliczamy masę etanolu
w 100 g roztworu ----- 10 g etanolu
1900g ----- x
x=1900*10/100=190g
zapisujemy reakcję utleniania etanolu
46.07g 60.05g
C2H5OH + O2 ----> CH3COOH + H2O
190g x
x=190*60.05/46.07=247.7g
obliczamy teraz C%
C%=ms*100%/mr=247.7*100/1900=13.04%