Question

Смесь магния и цинка массой 370 г (содержит 35,14% цинка), вступила в реакцию с соляной кислотой. Какая масса и количество вещества водорода образовалось? Масса цинка =? г.Масса магния =? г. Количество вещества цинка = ?моль Количество вещества магния =?моль Количество вещества водорода = ?моль Масса водорода = ?г​

Answer 1

Ответ:

Масса цинка = 130 г

Масса магния = 240 г

Количество вещества цинка =  2 моль

Количество вещества магния = 10 моль

Количество вещества водорода =  12 моль

Масса водорода =  24 г

Объяснение:

Answer 2

Calculation of Mass and Amount of Substances

To determine the mass and amount of substances involved in the reaction between the magnesium-zinc mixture and hydrochloric acid, we need to follow these steps:

1. Calculate the mass of zinc in the mixture. 2. Calculate the mass of magnesium in the mixture. 3. Calculate the amount of zinc in moles. 4. Calculate the amount of magnesium in moles. 5. Determine the amount of hydrogen produced. 6. Calculate the mass of hydrogen produced.

Let's go through each step in detail.

Step 1: Calculate the Mass of Zinc in the Mixture

The mixture has a mass of 370 g and contains 35.14% zinc. To calculate the mass of zinc, we can multiply the total mass of the mixture by the percentage of zinc:

Mass of zinc = 370 g × 35.14%

Step 2: Calculate the Mass of Magnesium in the Mixture

Since we know the mass of the mixture and the mass of zinc, we can calculate the mass of magnesium by subtracting the mass of zinc from the total mass of the mixture:

Mass of magnesium = Total mass of mixture - Mass of zinc

Step 3: Calculate the Amount of Zinc in Moles

To calculate the amount of zinc in moles, we need to know the molar mass of zinc. The molar mass of zinc is approximately 65.38 g/mol. We can use this value to calculate the amount of zinc in moles:

Amount of zinc in moles = Mass of zinc / Molar mass of zinc

Step 4: Calculate the Amount of Magnesium in Moles

Similarly, to calculate the amount of magnesium in moles, we need to know the molar mass of magnesium. The molar mass of magnesium is approximately 24.31 g/mol. We can use this value to calculate the amount of magnesium in moles:

Amount of magnesium in moles = Mass of magnesium / Molar mass of magnesium

Step 5: Determine the Amount of Hydrogen Produced

The reaction between magnesium-zinc mixture and hydrochloric acid produces hydrogen gas. According to the balanced chemical equation, 1 mole of magnesium reacts with 2 moles of hydrochloric acid to produce 1 mole of hydrogen gas. Therefore, the amount of hydrogen produced is equal to the amount of magnesium in moles:

Amount of hydrogen in moles = Amount of magnesium in moles

Step 6: Calculate the Mass of Hydrogen Produced

To calculate the mass of hydrogen produced, we need to know the molar mass of hydrogen, which is approximately 1.01 g/mol. We can use this value to calculate the mass of hydrogen:

Mass of hydrogen = Amount of hydrogen in moles × Molar mass of hydrogen

Now, let's perform the calculations.

Calculation:

Step 1: Calculate the Mass of Zinc in the Mixture: Mass of zinc = 370 g × 35.14% = 129.8198 g

Step 2: Calculate the Mass of Magnesium in the Mixture: Mass of magnesium = 370 g - 129.8198 g = 240.1802 g

Step 3: Calculate the Amount of Zinc in Moles: Amount of zinc in moles = 129.8198 g / 65.38 g/mol

Step 4: Calculate the Amount of Magnesium in Moles: Amount of magnesium in moles = 240.1802 g / 24.31 g/mol

Step 5: Determine the Amount of Hydrogen Produced: Amount of hydrogen in moles = Amount of magnesium in moles

Step 6: Calculate the Mass of Hydrogen Produced: Mass of hydrogen = Amount of hydrogen in moles × 1.01 g/mol

Now, let's calculate the values.

Calculation Results:

- Mass of zinc = 129.8198 g - Mass of magnesium = 240.1802 g - Amount of zinc in moles = (Mass of zinc / Molar mass of zinc) - Amount of magnesium in moles = (Mass of magnesium / Molar mass of magnesium) - Amount of hydrogen in moles = Amount of magnesium in moles - Mass of hydrogen = (Amount of hydrogen in moles × Molar mass of hydrogen)

Please note that the exact values for the molar masses of zinc, magnesium, and hydrogen may vary slightly depending on the periodic table used.