Нужно уравнять уравнение:
Na[Cr(OH)6] + H2O2 = Na2CrO4 + H2O + NaOH
2 Na3[Cr(OH)6] + 3 H2O2 = 2 Na2CrO4 + 2 NaOH + 8 H2O
2Na3[Cr(OH)6]+3H2O2=2Na2CrO4+2NaOH+8H2O
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2 Na3[Cr(OH)6] + 3 H2O2 = 2 Na2CrO4 + 2 NaOH + 8 H2O
2Na3[Cr(OH)6]+3H2O2=2Na2CrO4+2NaOH+8H2O