Question

Дано: m вещества (CUSO4)=8 г. m(H2O)=492г. W(CUSO4)=?

Answer 1

1. w(CuSO4) = m(CuSO4) / m(p-pa)
2. m(p-pa) = 8  + 492 = 500 г
3. w = 8 / 500 = 0.016 или 1,6 %

Answer 2

Calculation of W(CUSO4)

To calculate the mass of CUSO4 (copper sulfate), we need to know the molar mass of CUSO4. The molar mass of CUSO4 is the sum of the atomic masses of its constituent elements.

The atomic masses of the elements in CUSO4 are as follows: - Copper (Cu): 63.55 g/mol - Sulfur (S): 32.07 g/mol - Oxygen (O): 16.00 g/mol (there are four oxygen atoms in CUSO4)

Using these atomic masses, we can calculate the molar mass of CUSO4: Molar mass of CUSO4 = (63.55 g/mol) + (32.07 g/mol) + 4 * (16.00 g/mol) = 159.61 g/mol

Given that the mass of the CUSO4 is 8 g, we can calculate the number of moles of CUSO4: Number of moles of CUSO4 = mass of CUSO4 / molar mass of CUSO4 = 8 g / 159.61 g/mol ≈ 0.0501 mol

Now, let's calculate the mass of water (H2O) using the given information.

Given: m(H2O) = 492 g

To calculate the number of moles of water, we need to know the molar mass of water. The molar mass of water is the sum of the atomic masses of its constituent elements.

The atomic masses of the elements in water are as follows: - Hydrogen (H): 1.01 g/mol (there are two hydrogen atoms in water) - Oxygen (O): 16.00 g/mol

Using these atomic masses, we can calculate the molar mass of water: Molar mass of H2O = 2 * (1.01 g/mol) + 16.00 g/mol = 18.02 g/mol

Given that the mass of water is 492 g, we can calculate the number of moles of water: Number of moles of H2O = mass of H2O / molar mass of H2O = 492 g / 18.02 g/mol ≈ 27.28 mol

Now, let's calculate the mass of CUSO4 in the solution.

The mass of CUSO4 in the solution can be calculated using the formula: W(CUSO4) = (Number of moles of CUSO4) * (molar mass of CUSO4)

Substituting the values we calculated earlier: W(CUSO4) = 0.0501 mol * 159.61 g/mol ≈ 7.99 g

Therefore, the mass of CUSO4 in the solution is approximately 7.99 grams.

Note: The calculated value of W(CUSO4) is approximate due to rounding off the number of moles of CUSO4 and the molar mass of CUSO4.