: Tính khối lượng mol của các chất sau: Fe, Zn, H2, O2, N2, CO, CO2, Na2O, NH3, AlCl3, HCl, H2SO4, K3PO4

$1)4K+O_22K_2O$

$4:1:2$

$2)2Cu+O_2\xrightarrow{t^o}2CuO$

$2:1:2$

$3)2HgO\xrightarrow{đpdd}2Hg+O_2$

$2:2:1$

$4)4Al+3O_2\xrightarrow{t^o}2Al_2O_3$

$4:3:2$

$5)2Al(OH)_3\xrightarrow{t^o}Al_2O_3+3H_2O$

$2:1:3$

$6)2Fe+3Cl_2\xrightarrow{t^o}2FeCl_3$

$2:3:2$

$7)BaCl_2+Na_2SO_4\to BaSO_4\downarrow+2NaCl$

$1:1:1:2$

$8)FeO+2HCl\to FeCl_2+H_2O$

$1:2:1:1$

$9)2SO_2+O_2\xrightarrow[V_2O_5]{t^o}2SO_3$

$2:1:2$

$10)2KClO_3\xrightarrow[MnO_2]{t^o}2KCl+3O_2$

$2:2:3$

$11)3Ca(OH)_2+2FeCl_3\to 3CaCl_2+2Fe(OH)_3\downarrow$

$3:2:3:2$

$12)2NaOH+H_2SO_4\to Na_2SO_4+2H_2O$

$2:1:1:2$

$13)2Al+6HCl\to 2AlCl_3+3H_2$

$2:6:2:3$

$14)Fe(OH)_3+3HCl\to FeCl_3+3H_2O$

$1:3:1:3$

$15)CaCl_2+2AgNO_3\to Ca(NO_3)_2+2AgCl\downarrow$

$1:2:1:2$

$16)3Mg+2AlCl_3\to 3MgCl_2+2Al$

$3:2:3:2$

$17)2Al+3CuCl_2\to 2AlCl_3+3Cu\downarrow$

$2:3:2:3$

$18)3Fe+2H_3PO_4\to Fe_3(PO_4)_2+3H_2$

$3:2:1:3$

$19)BaCl_2+K_2SO_4\to BaSO_4\downarrow+2KCl$

$1:1:1:2$

$20)2KMnO_4\xrightarrow{t^o}K_2MnO_4+MnO_2+O_2$

$2:1:1:1$