Answer:
the percent by mass of phosphorus in phosphoric acid is approximately 31.62%.
Explanation:
To find the percent by mass of phosphorus (P) in phosphoric acid (H3PO4), you need to calculate the molar mass of H₃PO₄ and then determine the contribution of phosphorus to that mass.
The molar mass of H PO, is the sum of the molar masses of its constituent atoms:
Molar Mass (H₃PO₄) = (3 × Molar Mass of Hydrogen) + (Molar Mass of Phosphorus) + (4x Molar Mass of Oxygen)
Let's calculate it
Molar Mass (H₃PO₄) = (3 × 1.008 g/mol) + (30.97 g/mol) + (4 x 16.00 g/mol)
Molar Mass (HPO4)3.024+30.97+64.00
Molar Mass (H3PO4) = 97.994 g/mol
Now, to find the percent by mass of phosphorus, use the formula:
%P - Molar Mass of Phosphorus Molar Mass of H₃PO × 100
%P= 30.97 g/mol 97,994 g/ ) mol x 100
%P≈ 31.62%
So, the percent by mass of phosphorus in phosphoric acid is approximately 31.62%.
