A.18,0 gam.B.86,4 gam.C.52,2 gam.D.34,2 gam.
A.C2H5O2N.B.C3H7O2N.C.C4H9O2N.D.C5H11O2N.
A.HCl.B.H2SO4.C.CH3COOH.D.
A.25,88.B.51,76.C.58,16.D.29,08.
A.1B.2C.3D.4
A.32,69.B.34,32.C.36,29.D.33,42.
A.3B.4C.5D.6
A.41,5%.B.43,5%.C.46,5%.D.48,0%.
A.24%.B.26%.C.28%.D.30%.
A.54,92%.B.66,28%.C.74,69%.D.80,09%.
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