11.2 l of hydrogen iodide was dissolved in 200 g of a 10% solution of hydroiodic acid

11.2 l of hydrogen iodide was dissolved in 200 g of a 10% solution of hydroiodic acid. find the concentration of hydrogen iodide in the resulting solution

Let’s find the amount of hydrogen iodide substance.

n = V: Vn.

n = 11.2 L: 22.4 L / mol = 0.5 mol.

Let’s find the mass of hydrogen iodide.

m = n × M,

M (HI) = 128 g / mol.

m (HI) = 128 g / mol × 0.5 mol = 64 g.

Find the mass of HI in solution.

W = m (substance): m (solution) × 100%,

m (HI) = (200 g × 10%): 100% = 20 g.

m (substance) 2 = 64 g + 20 g = 84 g.

m (solution) 2 = 200 g + 64 g = 264 g.

W2 = (84g: 264g) × 100% = 31.82%.

Answer: 31.82%.