Answer:
Percent P ≈ 20.79%
Step-by-step explanation:
To determine the percent phosphorus (P) in the sample, we need to consider the composition of ammonium phosphate.
Ammonium phosphate has the chemical formula (NH4)3PO4, and its molar mass is 149.09 g/mol.
In (NH4)3PO4, we have 1 atom of phosphorus (P) and a total of 149.09 g/mol.
To calculate the percent P, we divide the molar mass of P by the molar mass of (NH4)3PO4 and multiply by 100:
Percent P = (Molar mass of P / Molar mass of (NH4)3PO4) × 100
Molar mass of P = 30.97 g/mol
Percent P = (30.97 g/mol / 149.09 g/mol) × 100
Percent P ≈ 20.79%
Therefore, the percent phosphorus (P) in the sample is approximately 20.79%.