Что именно надо сделать? Уровнять? Если да то вот:
<span>1) 2Fe</span><span> + </span><span>6H2SO4</span><span> = </span><span>Fe2(SO4)3</span><span> + </span><span>3SO2↑</span><span> + </span><span>6H2O
</span>
2) Cu<span> + </span><span>4HNO3</span><span> = </span>Cu<span>(NO3)</span>2<span> + </span><span>2NO2↑</span><span> + </span><span>2H2<span>O</span></span>
3NaOH + H₃PO₄ = Na₃PO₄ + 3H₂O<span>
3</span>Na⁺ + 3OH⁻ + 3H⁺ + PO₄³⁻ = 3Na⁺ + PO₄³⁻ + 3H₂O<span>
3</span>H⁺ + 3OH⁻ = 3H₂<span>O</span>