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Cm=1mol/dm³
n=Cm*v
n=0,25*1
n=0,25mola
0,25mola ---- 21,5g
1mol ---------- xg
x = 86g
Masa molowa = 86g/mol
Wzór sumaryczny ketonu to CnH2nO, więc
CnH2nO = 86
12n+2n+16 = 86
14n = 70
n = 5
Wzór ketonu to C₅H₁₀O -- pentanon