Question

Сера массой 6,4 г прореагировала с достаточным кол-вом водорода. Продукт их взаемодействия провзаимодействовал с избытком раствора натрий гидроксид. Вычислите кол-во вещества и массу соли, которая образовалась

Answer 1

Решение на листочке -----------

Answer 2

Calculation of the Amount of Substance and Mass of Salt Formed

To calculate the amount of substance and mass of the salt formed, we need to determine the balanced chemical equation for the reaction between sulfur and hydrogen, as well as the reaction between the resulting product and excess sodium hydroxide.

1. Reaction between sulfur and hydrogen: - The balanced chemical equation for the reaction between sulfur and hydrogen is: ``` S + H2 -> H2S ``` - From the given information, we know that the mass of sulfur is 6.4 g. - To calculate the amount of substance of sulfur, we need to convert the mass to moles using the molar mass of sulfur. - The molar mass of sulfur (S) is approximately 32.06 g/mol. - Therefore, the amount of substance of sulfur is: ``` Amount of substance of sulfur = mass of sulfur / molar mass of sulfur = 6.4 g / 32.06 g/mol ≈ 0.1997 mol ```

2. Reaction between the product and excess sodium hydroxide: - The balanced chemical equation for the reaction between hydrogen sulfide (H2S) and sodium hydroxide (NaOH) is: ``` H2S + 2NaOH -> Na2S + 2H2O ``` - From the given information, we know that there is an excess of sodium hydroxide. - This means that all the hydrogen sulfide will react with the sodium hydroxide, and there will be no leftover sodium hydroxide. - Therefore, the amount of substance of hydrogen sulfide is equal to the amount of substance of sulfur calculated earlier, which is approximately 0.1997 mol.

3. Calculation of the amount of substance and mass of the salt (sodium sulfide, Na2S) formed: - From the balanced chemical equation, we can see that 1 mole of hydrogen sulfide reacts to form 1 mole of sodium sulfide. - Therefore, the amount of substance of sodium sulfide is also approximately 0.1997 mol. - To calculate the mass of sodium sulfide, we need to convert the amount of substance to mass using the molar mass of sodium sulfide. - The molar mass of sodium sulfide (Na2S) is approximately 78.04 g/mol. - Therefore, the mass of sodium sulfide formed is: ``` Mass of sodium sulfide = amount of substance of sodium sulfide * molar mass of sodium sulfide = 0.1997 mol * 78.04 g/mol ≈ 15.59 g ```

Answer:

The amount of substance of the salt (sodium sulfide, Na2S) formed is approximately 0.1997 mol, and the mass of the salt is approximately 15.59 g.