Question

электронный баланс химия срочно )
na+h2o => naoh+h2 ;
pb(no3)2 => 2pbo+no2+o2

Answer 1

2Na + 2H₂O = 2NaOH + H₂
Баланс
$left. begin{array}{r} mathrm{Na^{0}-e^{-}to Na^{+}} \ mathrm{2H^{+}+2e^{-}to H_{2}^{0}} end{array} right|2 left| begin{array}{l} mathrm{2-reducing;agent} \ mathrm{1-oxidizing;agent} end{array} right.$.

2Pb(NO₃)₂ = 2PbO + 4NO₂ + O₂
Баланс
$left. begin{array}{r} mathrm{2O^{-2}-4e^{-}to O_{2}^{0}} \ mathrm{N^{+5}+e^{-}to N^{+4}} end{array} right|4 left| begin{array}{l} mathrm{1-reducing;agent} \ mathrm{4-oxidizing;agent} end{array} right.$.