Question

ПОЖАЛУЙСТА, СРОЧНО НАДО ДО 9 УТРА Реакция разрушения гексагидроксохромата (III) натрия пероксидом водородапротекает по схеме:Na3[Сr(OН)6]+Н2O2→Nа2СrO4+…+…Какая масса раствора гидроксида натрия с w(NaOH)=20% может быть получена,если в реакцию запущено по 1 моль комплекса и пероксида водорода.

Answer 1

Ответ: 133,33 г

Дано:

n(Na3[Сr(OН)6]) = 1 моль

n(H2O2) = 1 моль

w(NaOH)=20%, или 0,2

m(p-pa NaOH)-?

Объяснение:

M(NaOH) = 40 г/моль

Составляем УХР:

2Na3[Сr(OН)6]+3Н2O2 = 2Na2CrO4 + 2NaOH + 8H2O

Из УХР видно, что n(Na3[Cr(OH)6]):n(H2O)= 2:3 = 1:1.5, а по условию задачи n(Na3[Cr(OH)6]):n(H2O)= 1:1, то есть пероксид водорода взят в недостатке, расчеты ведем по пероксиду водороду (то есть веществу, взятому в недостатке), из УХР следует, что                           n(NaOH)=²/₃n(H₂O₂)

n(NaOH) = ²/₃*1 моль = 0,667 моль

m(NaOH) = n(NaOH)*M(NaOH) = 0,667 моль*40 г/моль = 26,667 г

m(p-pa(NaOH) = m(NaOH)/ω(NaOH) = 26.667 г/0,2 = 133,33 г

Ответ: 133,33 г

Answer 2

Reaction of Sodium Hexahydroxochromate(III) with Hydrogen Peroxide

The reaction of sodium hexahydroxochromate(III) with hydrogen peroxide can be represented by the following equation: Na3[Cr(OH)6] + H2O2 → Na2CrO4 + ...

The specific products of the reaction are not provided in the question, so it's important to note that the reaction may produce additional compounds depending on the conditions and the stoichiometry of the reaction.

Calculation of Sodium Hydroxide Solution Mass

To calculate the mass of a sodium hydroxide solution with a concentration of w(NaOH) = 20% that can be obtained from the given reaction, we need to consider the stoichiometry of the reaction and the molar masses of the compounds involved.

Given: - Moles of sodium hexahydroxochromate(III) = 1 - Moles of hydrogen peroxide = 1 - Concentration of sodium hydroxide solution, w(NaOH) = 20%

We can use the stoichiometry of the reaction to determine the amount of sodium hydroxide produced and then calculate the mass of the solution.

Calculation Steps

1. Determine the balanced chemical equation for the reaction of sodium hexahydroxochromate(III) with hydrogen peroxide. 2. Use the stoichiometry of the reaction to find the moles of sodium hydroxide produced. 3. Calculate the mass of the sodium hydroxide solution based on its concentration.

Conclusion

By following these steps, we can calculate the mass of the sodium hydroxide solution that can be obtained from the given reaction. If you need further assistance with the specific calculation, feel free to ask for more details!