... 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 ... C + 2H2SO4c CO2 + 2SO2 + 2H2O Fe3O4 + 4Cd Cõu HNG DN CHM K THI CHN HC SINH GII VN HểA LP THCS Khúa thi ngy 17 thỏng nm 2015 Mụn thi: HểA HC im 1,25 1,0 1,5 1,25 2,0 t Cu + 2H2SO4c CuSO4 + ... 7.2 0, 4=1 a = 0, b = 0, 160 ì 0,1 + 40a = 24 95 a + 103b+166c =93 , c = 0, Vy mB = mAgCl + mAgBr + AgI = 143,5.0,4+188.0,4+235.0,2= 1 79, 6 gam CaO,to CH3COONa + NaOH CH4 + Na2CO3 1500 C...