HNO3 (+5) 2KIO3 +5 Na2SO3 + H2SO4 = I2 +5 Na2SO4 +H2O + K2SO4
N2O5 (+5) 2 I(+5) +10e = I2(0) 1
NaNO2 (+3) S(+4) - 2e = S(+6) 5
NH3 (-3) NaNO2 + PbO2 +H2SO4 = NaNO3 + PbSO4 + H2O
NH4(-3)NO3(+5) N(+3) -2e = N(+5) 1
N2(0) Pb(+4) +2e = Pb(+2) 1
H3PO4 (+5) SnCl2 + 2FeCl3 = SnCl4 +2 FeCl2
P2O5 (+5) Sn(+2) -2e = Sn(+4) 1
PH3 (-3) Fe(+3) +1e = Fe(+2) 2
P(0)
P2O3 (+3)
H4P2O7 (+5)
2)180+20=200. 20/200=0.1x100=10%
3)150x10/15=100