1)w(BaCl)=20/100=0,2 или 20%
2)m(р-ра)=5+20=25
w(C₁₂H₂₂O₁₁)=5/25=0,2 или 20%
3)m(NaCl)=0,009·600=5,4
m(р-ля)=600-5.4=594.6
H2SO4 + 2KOH = K2SO4 + 2H2O
2H(+) + SO4(-2) + 2K(+) + 2OH(-) = 2K(+) + SO4(-2) + 2H2O
2H(+) + 2OH(-) = 2H2O
2KMnO₄ = K₂MnO₄ + MnO₂ + O₂
2H₂S + 3O₂ = 2SO₂ + 2H₂O
SO₂ + 2H₂S = 3S + 2H₂O
3S + 6NaOH = Na₂SO₃ + 2Na₂S + 3H₂O
<span>2Na + O2 = Na2O<span>2
Na2O2 + 2H2O = 2NaOH + H2O2
</span></span>CH3COOH<span> + </span>NaOH<span> = </span>CH3<span>COONa + H2O
</span><span>CH3COONa + HBr = CH3COOH + NaBr
</span><span>2NaBr + Cl2 = 2NaCl + Br2
</span>2NaCl = 2Na + Cl<span>2 электролиз</span>