n(CO2)==0.10mol, 则2.00g有机物中:n(C)=n(CO2)=0.10mol,m(C)=0.10mol×12g/mol=1.20g, n(H2O)==0.08mol, 则2.00g有机物中:n(H)=2n(H2O)=0.16mol,m(H)=0.16mol×1g/mol=0.16g, 因(1.20g+0.16g)<2.00g, 所以有机物中还应还用O元素,且m(O)=2.00g-1.20g-0.16g=0.64g,n(O)==0.04mol, 则有机物中:n(C):n(H):n(O)=0.10mol:0.16mol:0.04mol=5:8:2, 所以该有机物的最简式为C5H8O2, 分子式为C5H8O2或C10H16O4, 故选CD. |