Hóa học Lớp 8: : Tính khối lượng mol của các chất sau: Fe, Zn, H2, O2, N2, CO, CO2, Na2O, NH3, AlCl3, HCl, H2SO4, K3PO4

Question

Hóa học Lớp 8:  : Tính khối lượng mol của các chất sau: Fe, Zn, H2, O2, N2, CO, CO2, Na2O, NH3, AlCl3, HCl, H2SO4, K3PO4, giúp em giải bài hóa này ạ, em cảm ơn thầy cô và các bạn nhiều.

thanhtung · Answer

$1)4K+O_22K_2O$   $4:1:2$   $2)2Cu+O_2 xrightarrow{t^o}2CuO$   $2:1:2$   $3)2HgO xrightarrow{đpdd}2Hg+O_2$   $2:2:1$   $4)4Al+3O_2 xrightarrow{t^o}2Al_2O_3$   $4:3:2$   $5)2Al(OH)_3 xrightarrow{t^o}Al_2O_3+3H_2O$   $2:1:3$   $6)2Fe+3Cl_2 xrightarrow{t^o}2FeCl_3$   $2:3:2$   $7)BaCl_2+Na_2SO_4 to BaSO_4 downarrow+2NaCl$   $1:1:1:2$   $8)FeO+2HCl to FeCl_2+H_2O$   $1:2:1:1$   $9)2SO_2+O_2 xrightarrow[V_2O_5]{t^o}2SO_3$   $2:1:2$   $10)2KClO_3 xrightarrow[MnO_2]{t^o}2KCl+3O_2$   $2:2:3$   $11)3Ca(OH)_2+2FeCl_3 to 3CaCl_2+2Fe(OH)_3 downarrow$   $3:2:3:2$   $12)2NaOH+H_2SO_4 to Na_2SO_4+2H_2O$   $2:1:1:2$   $13)2Al+6HCl to 2AlCl_3+3H_2$   $2:6:2:3$   $14)Fe(OH)_3+3HCl to FeCl_3+3H_2O$   $1:3:1:3$   $15)CaCl_2+2AgNO_3 to Ca(NO_3)_2+2AgCl downarrow$   $1:2:1:2$   $16)3Mg+2AlCl_3 to 3MgCl_2+2Al$   $3:2:3:2$   $17)2Al+3CuCl_2 to 2AlCl_3+3Cu downarrow$   $2:3:2:3$   $18)3Fe+2H_3PO_4 to Fe_3(PO_4)_2+3H_2$   $3:2:1:3$   $19)BaCl_2+K_2SO_4 to BaSO_4 downarrow+2KCl$   $1:1:1:2$   $20)2KMnO_4 xrightarrow{t^o}K_2MnO_4+MnO_2+O_2$   $2:1:1:1$

lanminhngoc · Answer

M_{Fe} = 56 $g/mol$   M_{Zn} = 65 $g/mol$   M_{H_2} = 2 . 1 = 2 $g/mol$   M_{O_2} = 16 . 2 = 32 $g/mol$   M_{N_2} = 14 . 2 = 28 $g/mol$   M_{CO} = 12 + 16 = 28 $g/mol$   M_{CO_2} = 12 + 32 = 44 $g/mol$   M_{Na_2O} = 23 . 2 + 16 = 62 $g/mol$   M_{NH_3} = 3 + 14 = 17 $g/mol$   M_{AlCl_3} = 27 + (35,5 . 3) = 133,5 $g/mol$   M_{HCl} = 1 + 35,5 = 36,5 $g/mol$   M_{H_2SO_4} = 2 + 32 + 16 . 4 = 98 $g/mol$   M_{K_3PO_4} = 39 . 3 + 31 + 16 . 4 = 212 $g/mol$