Объяснение:
сума коефіцієнтів :
BaCl2 +2AgNO3 =Ba(NO3)2 + 2AgCl↓ 6
Ba(OH)2 + H2SO4 = BaSO4↓ + 2H2O 5
FeCl3 + 3NaOH = Fe(OH)3 + 3NaCl 8
2Al(OH)3 + 3H2SO4 =Al2(SO4)3 + 6H2O 12
CaO + 2HNO3 = Ca(NO3)2 + H2O 5
6NaOH + Fe2(SO4)3 = 2Fe(OH)3+ 3Na2SO4 12
3Ca(OH)2 + P2O5 = Ca3(PO4)2 + 3H2O 8
Mg(OH)2 + 2HCl =MgCl2 + 2H2O 6
А) Mr(Cu2O) = 64*2 + 16 =144
Mr(KNO3) = 39+14+16*3 = 101
Mr(Na2SiO3) = 23*2 + 28 + 16*3 = 122
Mr(H3PO4) = 1*3 + 31 + 16*4 = 98
Б) Mr(Al2(SO4)3) = 27*2 + 32*3 + 16*12 = 342
Mr(H2SO4) = 1*2 + 32 + 16*4 = 98
Mr(K2S) = 39*2 + 32 = 110
Mr(Mg(OH)2)= 24 + 16*2 + 1*2 = 58
В) Mr(SO3) = 32 + 16*3 = 80
Mr(CaCO3) = 40 + 12 + 16*3 = 100
Mr(H2SO3) = 1*2 + 32 + 16*3 = 82
Mr(NH4OH) = 14 + 1*5 + 16 = 35
Г) Mr(PO3) = 31 + 16*3 = 79
Mr(Zn(OH)2) = 65 + 16*2 + 1*2 = 99
Mr(H2SiO3) = 1*2 + 28 + 16*3 =78
Mr(AlCl3) = 27 + 35,5*3 = 133,5
