Question

Массовая доля оксида фосфора (V) в пробе суперфосфата составляет 20% . Вычислите массовую долю дигидрофосфата кальция в этом удобрении

Answer 1

Амега равно m/M по этой формуле

Answer 2

Calculating the Mass Fraction of Calcium Dihydrogen Phosphate in Superphosphate Fertilizer

To calculate the mass fraction of calcium dihydrogen phosphate in the superphosphate fertilizer, we can use the given information about the mass fraction of phosphorus oxide (V) in the sample.

Given: - Mass fraction of phosphorus oxide (V) in the superphosphate sample = 20%

The superphosphate fertilizer typically contains calcium dihydrogen phosphate, which can be represented by the chemical formula Ca(H2PO4)2.

To calculate the mass fraction of calcium dihydrogen phosphate, we can use the molar mass of phosphorus oxide (V) and calcium dihydrogen phosphate.

The molar mass of phosphorus oxide (V) (P2O5) is approximately 141.94 g/mol, and the molar mass of calcium dihydrogen phosphate (Ca(H2PO4)2) is approximately 234.05 g/mol.

Using the given mass fraction of phosphorus oxide (V), we can calculate the mass fraction of calcium dihydrogen phosphate in the superphosphate fertilizer.

Calculation:

The mass fraction of calcium dihydrogen phosphate can be calculated using the following formula:

Mass fraction of Ca(H2PO4)2 = (Molar mass of Ca(H2PO4)2 / Molar mass of P2O5) * Mass fraction of P2O5

Substituting the values: Mass fraction of Ca(H2PO4)2 = (234.05 / 141.94) * 20%

Result:

The mass fraction of calcium dihydrogen phosphate in the superphosphate fertilizer is approximately 32.64%.