Question

Какая масса сульфата цинка образуется при взаимодействии цинка массой 13 граммов с раствором содержащим 30 граммов серной кислоты

Answer 1

Если не округлять, то ответ получится 56.875г

Answer 2

Calculation of Zinc Sulfate Mass

To calculate the mass of zinc sulfate formed when zinc reacts with sulfuric acid, we need to determine the balanced chemical equation for the reaction. The balanced equation is as follows:

Zn + H2SO4 → ZnSO4 + H2

From the balanced equation, we can see that 1 mole of zinc reacts with 1 mole of sulfuric acid to produce 1 mole of zinc sulfate. The molar mass of zinc sulfate (ZnSO4) is approximately 161.47 g/mol.

To find the mass of zinc sulfate formed, we need to calculate the number of moles of zinc and sulfuric acid involved in the reaction. We can then use the molar ratio from the balanced equation to determine the number of moles of zinc sulfate formed. Finally, we can convert the moles of zinc sulfate to grams using its molar mass.

Let's calculate the mass of zinc sulfate formed when 13 grams of zinc reacts with a solution containing 30 grams of sulfuric acid.

Calculation Steps:

1. Calculate the number of moles of zinc: - The molar mass of zinc (Zn) is approximately 65.38 g/mol. - Number of moles of zinc = mass of zinc / molar mass of zinc - Number of moles of zinc = 13 g / 65.38 g/mol

2. Calculate the number of moles of sulfuric acid: - The molar mass of sulfuric acid (H2SO4) is approximately 98.09 g/mol. - Number of moles of sulfuric acid = mass of sulfuric acid / molar mass of sulfuric acid - Number of moles of sulfuric acid = 30 g / 98.09 g/mol

3. Determine the limiting reactant: - The limiting reactant is the reactant that is completely consumed in the reaction and determines the amount of product formed. - To determine the limiting reactant, compare the moles of zinc and sulfuric acid calculated in steps 1 and 2. - The reactant with the smaller number of moles is the limiting reactant.

4. Calculate the number of moles of zinc sulfate formed: - From the balanced equation, we know that 1 mole of zinc reacts with 1 mole of sulfuric acid to produce 1 mole of zinc sulfate. - The number of moles of zinc sulfate formed is equal to the number of moles of the limiting reactant.

5. Calculate the mass of zinc sulfate formed: - Mass of zinc sulfate = number of moles of zinc sulfate formed * molar mass of zinc sulfate

Let's perform the calculations:

1. Number of moles of zinc: - Number of moles of zinc = 13 g / 65.38 g/mol = 0.198 moles

2. Number of moles of sulfuric acid: - Number of moles of sulfuric acid = 30 g / 98.09 g/mol = 0.306 moles

3. Determining the limiting reactant: - The reactant with the smaller number of moles is the limiting reactant. - In this case, zinc is the limiting reactant because it has fewer moles than sulfuric acid.

4. Number of moles of zinc sulfate formed: - The number of moles of zinc sulfate formed is equal to the number of moles of the limiting reactant, which is 0.198 moles.

5. Mass of zinc sulfate formed: - Mass of zinc sulfate = 0.198 moles * 161.47 g/mol = 31.98 grams

Therefore, when 13 grams of zinc reacts with a solution containing 30 grams of sulfuric acid, approximately 31.98 grams of zinc sulfate are formed.