... GIO DC V O TO QUNG TR CHNH THC Cõu í Cõu 1 Cõu 2 HNG DN CHM K THI CHN HC SINH GII VN HểA LP THCS Khúa thi ngy 17 thỏng nm 2015 Mụn thi: HểA HC Ni dung BaO + H2O Ba(OH)2 Ba(OH)2 + SO3 BaSO4 + ... 2HCl MgCl2 + H2O (4) 4,368.2 = 0, 39 mol nHCl(1,2)=2nH2= 22, nHCl(3,4)=0, 796 . 2-0 , 39= 1,202 mol nO(oxit)=1,202/2=0,601 mol Vy m(mui)= 26,43 0,601.16 + 0, 796 .2.35,5 = 73,33 gam Nung hn hp: t0 ... nHCl+ 3nAlCl 3(3) + nAl(OH)3(4) = 0,125 + 3.0,1 + (0,1 x) = (0,525 x) mol 78x = 23.(0,525 - x) - 3 ,99 5 => x = 0,08 mol m = 23(0,525 0,08) = 10,235 gam 3,136 5,88 = 0,14 mol, nSO2 = = 0, 2625...