Cu+HgCI2=CuCI2+Hg
CuCI2+2KOH=Cu(OH)2+2KCI
Cu(OH)2=CuO+H2O
CuO+H2SO4=CuSO4+H2O
CuSO4+Fe=FeSO4+Cu
H2O+SO3=H2SO4
Ag2O+HNO3=AgNO3+H2O
NaOH+HNO3=NaNO3+H2O
38.67.....................
1)W=40/100*100=40\%
2)W=40/96*100=41.7\%
3)W=40/71*100=56.34\% CaCl2
H2+O2=H2O
2H-2e=H2
O2+4e=2O
2Na +2H2O = 2NaOH +H2
Na(o)-1e=Na(+)
H2(+)+2e=H2(o)