Calculate the mole fraction of phosphoric acid (H₃PO₄)in a 25.4% (by mass)aqueous solution. A)0.0589 B)0.0626 C)0.259 D)1.00 E)4.14

Question

Quizplus · Accepted Answer

To calculate the mole fraction of H3PO4, first assume 100 g of solution, which contains 25.4 g of H3PO4 and 74.6 g of water. Calculate moles: H3PO4 = 25.4 g / 98 g/mol = 0.259 moles; H2O = 74.6 g / 18 g/mol = 4.144 moles. Mole fraction of H3PO4 = 0.259 / (0.259 + 4.144) = 0.0589.

Calculate the Mole Fraction of Phosphoric Acid (H3PO4)in a 25

Calculate the Mole Fraction of Phosphoric Acid (H₃PO₄)in a 25