Дано
m(CxHyOz)=3.2 g
m(CO2)=4.4 g
m(H2O)=3.6 g
D(H2)=16
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M(CxHyOz)-?
n(CO2)=m/M=4.4/44 = 0.1 mol
n(H2O)=m/M=3.6/18=0.2 mol
n(C)=n(CO2)=0.1 mol
n(H2)=2n(H2O)=0.2*2=0.4 mol
m(C)=0.1*12=1.2 g
m(H2)=1*0.4=0.4 g
m(O)=3.6-1.2-0.4=1.6 g
n(O)=1.6 /16 = 0.1 mol
n(C) : n(H) : n(O) = 0.1 : 0.4 : 0.1
CH4O => CH3OH
M(CxHyOz)=2*D(H2) = 2*16 = 32 g/mol
M(CH3OH)=32 g/mol
ответ метанол.