Question

Рассчитайте относительность молекулярную массу фосфата натрия Na3Po4 и массовые доли элементов в нем

Answer 1

Ответ:

Mr[NaMnO4] = Ar[Mn] + Ar[Na] + Ar[O] * 4 = 54 + 23 + 16 * 4 = 142

ω (Mn) = 55 : 142 * 100 = 39 %

ω (Na) = 23 : 142 * 100 = 16 %

ω (O) = 64 : 142 * 100 = 45 %

Объяснение:

Answer 2

Calculation of the Molar Mass of Sodium Phosphate (Na3PO4)

To calculate the molar mass of sodium phosphate (Na3PO4), we need to determine the atomic masses of each element in the compound and then multiply them by their respective subscripts.

The atomic masses of the elements involved are as follows: - Sodium (Na) = 22.99 g/mol - Phosphorus (P) = 30.97 g/mol - Oxygen (O) = 16.00 g/mol

Now, let's calculate the molar mass of sodium phosphate (Na3PO4):

Molar mass of Na3PO4 = (3 * atomic mass of Na) + atomic mass of P + (4 * atomic mass of O)

Molar mass of Na3PO4 = (3 * 22.99 g/mol) + 30.97 g/mol + (4 * 16.00 g/mol)

Molar mass of Na3PO4 = 68.97 g/mol + 30.97 g/mol + 64.00 g/mol

Molar mass of Na3PO4 = 163.94 g/mol

Therefore, the molar mass of sodium phosphate (Na3PO4) is 163.94 g/mol.

Mass Percentages of Elements in Sodium Phosphate (Na3PO4)

To calculate the mass percentages of the elements in sodium phosphate (Na3PO4), we need to determine the molar mass of each element and then divide it by the molar mass of the compound. Finally, we multiply the result by 100 to get the percentage.

1. Sodium (Na): - Molar mass of Na = 22.99 g/mol - Mass percentage of Na = (3 * molar mass of Na) / molar mass of Na3PO4 * 100

2. Phosphorus (P): - Molar mass of P = 30.97 g/mol - Mass percentage of P = molar mass of P / molar mass of Na3PO4 * 100

3. Oxygen (O): - Molar mass of O = 16.00 g/mol - Mass percentage of O = (4 * molar mass of O) / molar mass of Na3PO4 * 100

Let's calculate the mass percentages of the elements in sodium phosphate (Na3PO4):

1. Sodium (Na): - Mass percentage of Na = (3 * 22.99 g/mol) / 163.94 g/mol * 100

2. Phosphorus (P): - Mass percentage of P = 30.97 g/mol / 163.94 g/mol * 100

3. Oxygen (O): - Mass percentage of O = (4 * 16.00 g/mol) / 163.94 g/mol * 100

Therefore, the mass percentages of the elements in sodium phosphate (Na3PO4) are as follows: - Sodium (Na): 33.33% - Phosphorus (P): 18.92% - Oxygen (O): 47.75%

Please note that the above calculations are based on the atomic masses provided and may vary slightly depending on the source and the isotopic composition of the elements.