... 1:1 Cụ cn dung dch A thu c m (gam.) mui khan giỏ tr ca m, a l: A 55 , 35 gam v 2,2M B 55 , 35 gam v 0,22M C 53 ,55 gam v 2,2M D 53 ,55 gam v 0,22M Hng dn gii n N 2O = n N = 1,792 = 0,04 mol ì 22,4 Ta ... ng v A 65Cu: 27 ,5% ; 65 B Cu: 70% ; 63 Cu: 72 ,5% 63 Cu: 30% C 65Cu: 72 ,5% ; 63 D 65Cu: 30% ; Cu: 70% Cu: 27 ,5% 63 Hng dn gii Gi x l % ca ng v 65 29 Cu ta cú phng trỡnh: M = 63 ,55 = 65. x + 63(1 ... (ktc) v t i vi O bng 1,31 25 Xỏc nh %NO v %NO2 theo th tớch hn hp X v lng m ca Fe ó dựng? A 25% v 75% ; 1,12 gam B 25% v 75% ; 11,2 gam C 35% v 65% ; 11,2 gam D 45% v 55 %; 1,12 gam Hng dn gii Ta...