<span>Na2SiO3 + Ca(NO3)2 </span>= 2NaNO3 + CaSiO3 (осадок)
Dx(h2) = 1.4375 ==> M(x) = 1.4375 * 32 = 46 г/моль
W(C) = 52.17%, W(H) = 13.04% ==> W(O) = 100% - 13.04% - 52.17% = 34.79%.
n(C) = (52.17 * 46)/12 * 100 = 2;
n(H) = (13.04 * 46)/100 = 6;
n(O) = (34.79 * 46)/16 * 100 = 1;
C2H6O или C2H5OH — этанол.
10FeSO4 + 2KMnO4 +8H2SO4 -> 2MnSO4 +5 Fe2(SO4)3 + K2SO4 + 8H2O
окислитель :MnO4− + 8H+ + 5e− = Mn2+ + 4H2O /1
восстановитель :Fe2+ − 1e− = Fe3+ /5
<span>MnO4− + 8H+ + 5Fe2+ = Mn2+ + 4H2O + 5Fe3+</span>