... lng ca X ln lt l A HCHO v 50,56% B CH 3CHO v 67,16% C CH 3CHO v 49,44% D HCHO v 32,44% Cõu 43: Oxi hoỏ hon ton 4,4 gam hn hp cha cựng s mol ca hai ancol n chc cn dựng ht gam CuO Cho ton b lng anehit ... C trung bỡnh=0.7/0,5=1,4=> andehit cn tỡm l HCHO v CH 3CHO nHCHO=x mol v nCH 3CHO= y mol ta cú x+2y=0,7 v x+y=0,5 t ú tớnh s mol v t l phn trm lng HCHO Cõu 44: nCuO=n ancol=0,1 mol=> mi ancol l ... 0,25 mol H2 Cht X cú cụng thc ng vi cụng thc chung l A CnH2n- 1CHO (n 2) B CnH2n- 3CHO (n 2) C CnH2n (CHO) 2 (n 0) D CnH2n+ 1CHO (n 0) 6, Cho cỏc hp cht hu c: C2H2; C2H4; CH2O; CH2O2 (mch h); C3H4O2...