Дано
CH3OH
w(O)-?
Mr(CH3OH)=12+1*3+16+1=32
w(O)=16:32*100=50%
<span>5SnSO4 + 2KMnO4 + 8H2SO4 = 5Sn(SO4)2 + 2MnSO4 + K2SO4 + 8H2O</span>
Решение
CH4 + HNO3 = CH3NO2 + H2O
16-----61
32 -----х
х = 122
1) Zn + 2HCl = ZnCl2 + H2
2) ZnCl2 + 2KOH = Zn(OH)2 + 2KCl
3) Zn(OH)2 + 2NaCl = ZnCl2 + 2NaOH
4) ZnCl2 + H2SO4 = ZnSO4 + 2HCl
5) ZnCl2 + PbS = ZnS + PbCl2