Question

Определить массовую долю кислорода и фосфора в оксиде фосфора (P209).​ Пж срочно!

Answer 1

Ответ:

Кислород- 69,9

Фосфор- 30,0

Answer 2

Determining the Mass Fraction of Oxygen and Phosphorus in Phosphorus Oxide (P2O9)

To determine the mass fraction of oxygen and phosphorus in phosphorus oxide (P2O9), we can use the chemical formula of the compound to calculate the molar mass and then find the mass fraction of each element.

Chemical Formula of Phosphorus Oxide (P2O9): The chemical formula of phosphorus oxide is P2O9.

Molar Mass Calculation: To calculate the molar mass of phosphorus oxide (P2O9), we need to consider the atomic masses of phosphorus (P) and oxygen (O) and then multiply them by their respective subscripts in the chemical formula.

The atomic mass of phosphorus (P) is approximately 30.97 g/mol, and the atomic mass of oxygen (O) is approximately 16.00 g/mol.

The molar mass of phosphorus oxide (P2O9) can be calculated as follows: Molar mass = (2 * atomic mass of phosphorus) + (9 * atomic mass of oxygen)

Molar mass = (2 * 30.97 g/mol) + (9 * 16.00 g/mol)

Molar mass = 61.94 g/mol + 144.00 g/mol

Molar mass = 205.94 g/mol

Calculating Mass Fraction: The mass fraction of each element in the compound can be calculated using the following formulas:

Mass fraction of oxygen = (Number of moles of oxygen * Molar mass of oxygen) / Molar mass of compound Mass fraction of phosphorus = (Number of moles of phosphorus * Molar mass of phosphorus) / Molar mass of compound

Using the molar mass of phosphorus oxide (P2O9) calculated earlier, we can determine the mass fraction of oxygen and phosphorus in the compound.

Let's proceed with the calculations to determine the mass fractions of oxygen and phosphorus in phosphorus oxide (P2O9).

Calculation of Mass Fraction of Oxygen: Number of moles of oxygen = 9 moles Mass fraction of oxygen = (9 * 16.00 g/mol) / 205.94 g/mol Mass fraction of oxygen ≈ 0.698 or 69.8%

Calculation of Mass Fraction of Phosphorus: Number of moles of phosphorus = 2 moles Mass fraction of phosphorus = (2 * 30.97 g/mol) / 205.94 g/mol Mass fraction of phosphorus ≈ 0.305 or 30.5%

Conclusion: The mass fraction of oxygen in phosphorus oxide (P2O9) is approximately 69.8%, and the mass fraction of phosphorus is approximately 30.5%.