Question

Найти кол-во, массу и число атомов меди в 7,2г оксида меди (I)

Answer 1

Дано:
m(Cu2O) = 7,2 г
Найти:
m(Cu) - ?
n(Сu) -?
N(Cu)-?
Решение
n(Cu2O) = m/M = 7,2г/144 г/моль = 0,05 моль
n(Cu) = 0,05 моль
m(Cu) = n * M = 0,05 моль * 128 г/моль = 6,2 г
N(Cu) = n* N(A) = 0,05 * 6 * 10^23 = 0,3*10^23

Answer 2

Calculation of the Number, Mass, and Atoms of Copper in 7.2g of Copper(I) Oxide

To find the number, mass, and atoms of copper in 7.2g of copper(I) oxide (Cu2O), we can use the molar mass and Avogadro's number.

1. Molar Mass of Copper(I) Oxide (Cu2O): The molar mass of copper(I) oxide can be calculated by adding the atomic masses of copper (Cu) and oxygen (O) in the compound. According to the provided search snippet the molar mass of Cu2O is 40 + 16 = 56 g/mol.

2. Number of Moles of Copper(I) Oxide: To find the number of moles of copper(I) oxide, we can use the formula:

Number of moles = Mass / Molar mass

Substituting the given mass of 7.2g and the molar mass of 56 g/mol, we get:

Number of moles = 7.2g / 56 g/mol

Calculating this, we find that the number of moles of copper(I) oxide is approximately 0.1286 mol.

3. Number of Moles of Copper: Since there are two copper atoms in one molecule of copper(I) oxide, the number of moles of copper will be twice the number of moles of copper(I) oxide. Therefore:

Number of moles of copper = 2 * Number of moles of copper(I) oxide

Substituting the calculated value of 0.1286 mol, we find that the number of moles of copper is approximately 0.2572 mol.

4. Number of Atoms of Copper: To find the number of atoms of copper, we can use Avogadro's number, which states that there are 6.022 x 10^23 particles (atoms, molecules, or ions) in one mole of any substance.

Number of atoms of copper = Number of moles of copper * Avogadro's number

Substituting the calculated value of 0.2572 mol, we find that the number of atoms of copper is approximately 1.55 x 10^23 atoms.

5. Mass of Copper: To find the mass of copper, we can use the formula:

Mass = Number of moles of copper * Molar mass of copper

The molar mass of copper (Cu) is approximately 63.55 g/mol Substituting the calculated value of 0.2572 mol, we find that the mass of copper is approximately 16.35 g.

Summary:

In 7.2g of copper(I) oxide (Cu2O), there are approximately: - Number of moles of copper(I) oxide: 0.1286 mol - Number of moles of copper: 0.2572 mol - Number of atoms of copper: 1.55 x 10^23 atoms - Mass of copper: 16.35 g