Question

Как решить задачу для 8 класса по химии: рассчитать объём водорода (нормальные условия), который необходим для получения 2, 56 грамм меди из CuO.

Answer 1

            х л   2,56 г  
CuO + H2 = Cu + H2O
         22,4 л  64 г
 х = 0,896 л

Answer 2

Calculating the Volume of Hydrogen Gas Required to Obtain Copper from CuO

To calculate the volume of hydrogen gas (under normal conditions) required to obtain 2.56 grams of copper from CuO, we can use the following steps:

1. Balancing the Chemical Equation: - First, we need to write and balance the chemical equation for the reaction between CuO and hydrogen gas to obtain copper and water.

2. Molar Mass Calculation: - Next, we calculate the molar mass of CuO and Cu to determine the stoichiometry of the reaction.

3. Using Stoichiometry: - Then, we use the stoichiometry of the balanced chemical equation to find the amount of hydrogen gas required.

Balancing the Chemical Equation:

The balanced chemical equation for the reaction between CuO and hydrogen gas to obtain copper and water is:

CuO + H2 → Cu + H2O

Molar Mass Calculation:

The molar mass of CuO can be calculated using the atomic masses of copper (Cu) and oxygen (O) from the periodic table. The molar mass of Cu is 63.55 g/mol, and the molar mass of O is 16.00 g/mol.

The molar mass of CuO = 63.55 g/mol (Cu) + 16.00 g/mol (O) = 79.55 g/mol

The molar mass of Cu is 63.55 g/mol.

Using Stoichiometry:

From the balanced chemical equation, we can see that 1 mole of CuO reacts with 1 mole of H2 to produce 1 mole of Cu.

Given that the molar mass of CuO is 79.55 g/mol, we can calculate the moles of CuO present in 2.56 grams using the formula:

moles = mass / molar mass

moles of CuO = 2.56 g / 79.55 g/mol

Now, we can use the stoichiometry of the balanced chemical equation to find the moles of H2 required to react with the moles of CuO.

Conclusion:

By following these steps, you can calculate the volume of hydrogen gas (under normal conditions) required to obtain 2.56 grams of copper from CuO.