Question

ПОЖАЛУЙСТА Для полного восстановления железа из оксида железа 3 был использован газ, выделившийся при обработке 10 г сплава меди с цинком избытком 10%ного раствора соляной кислоты. после осуществления реакции восстановления масса оксида железа уменьшилась на 0,96 г. определите процентный состав медно-цинкового сплава.

Answer 1

To determine the percentage composition of the copper-zinc alloy, we need to analyze the given information and perform some calculations.

Given Information:

- Mass of copper-zinc alloy used: 10 g - Excess 10% hydrochloric acid solution used for the reaction - Mass of iron(III) oxide reduced: 0.96 g

Calculation Steps:

1. Calculate the moles of iron(III) oxide reduced. 2. Use the stoichiometry of the reaction to determine the moles of gas produced. 3. Calculate the moles of hydrochloric acid used. 4. Use the stoichiometry of the reaction between hydrochloric acid and zinc to determine the moles of zinc consumed. 5. Calculate the moles of copper in the alloy. 6. Calculate the moles of zinc in the alloy. 7. Calculate the mass percentages of copper and zinc in the alloy.

Let's perform these calculations step by step.

Step 1: Calculate the moles of iron(III) oxide reduced.

To calculate the moles of iron(III) oxide reduced, we need to use its molar mass. The molar mass of iron(III) oxide (Fe2O3) is 159.69 g/mol.

Moles of iron(III) oxide = Mass of iron(III) oxide reduced / Molar mass of iron(III) oxide Moles of iron(III) oxide = 0.96 g / 159.69 g/mol

Step 2: Use the stoichiometry of the reaction to determine the moles of gas produced.

From the given information, it is mentioned that a gas is produced during the reaction. However, the specific gas is not mentioned. To proceed with the calculation, we need to know the balanced chemical equation for the reaction.

Step 3: Calculate the moles of hydrochloric acid used.

To calculate the moles of hydrochloric acid used, we need to use its molar concentration and volume. However, the volume of the hydrochloric acid solution is not provided in the given information. Without this information, we cannot calculate the moles of hydrochloric acid used.

Step 4: Use the stoichiometry of the reaction between hydrochloric acid and zinc to determine the moles of zinc consumed.

Since we don't have the information to calculate the moles of hydrochloric acid used, we cannot proceed with this step.

Step 5: Calculate the moles of copper in the alloy.

To calculate the moles of copper in the alloy, we need to know the molar mass of copper. The molar mass of copper (Cu) is 63.55 g/mol.

Moles of copper = (Mass of copper-zinc alloy - Moles of iron(III) oxide * Molar mass of iron(III) oxide) / Molar mass of copper Moles of copper = (10 g - (0.96 g / 159.69 g/mol) * 159.69 g/mol) / 63.55 g/mol

Step 6: Calculate the moles of zinc in the alloy.

Since we don't have the information to calculate the moles of zinc consumed, we cannot proceed with this step.

Step 7: Calculate the mass percentages of copper and zinc in the alloy.

Since we don't have the information to calculate the moles of zinc in the alloy, we cannot proceed with this step.

In conclusion, without the necessary information, we cannot determine the percentage composition of the copper-zinc alloy.