2Al + 3CuSO4 = Al2(SO4)3 + 3Cu
CuSO4 + Mg = MgSO4 + Cu
CuO + H2SO4 = CuSO4 + H2O
AgNO3 + HCl = HNO3 + AgCl
CaCO3 + 2HCl = CaCl2 + H2O + CO2
Тут so2 b so3 вдруг пригодится
W(X) = Ar(X) * n * 100%
Mr вещ-ва
Mr(SO2) = 64
Mr(SO3) = 80
SO2
W(О) = 16 * 2 * 100% = 50%
64
SO3
W(О) = 16 * 3 * 100% = 60%
80
...............................
V(Au) = 0.001 см3
m(Au) = 19.3 × 0.001 = 0.02 (г)
n(Au) = 0.02/197 = 0.0001 (моль)
N(Au) = 0.0001 × 6.02 × 10^23 = 6.02 × 10^19 (атомов)