A mass of 400 g of water, 5.6 l of hydrogen chloride (HCI) was dissolved in it.

A mass of 400 g of water, 5.6 l of hydrogen chloride (HCI) was dissolved in it. How much hydrochloric acid is in the resulting solution?

Let’s write an expression to determine the mass fraction of a substance:
w (in-va) = (m (in-va) / m (solution)) * 100% = (V (in-va) / V (solution)) * 100%
Let’s determine the volume of water, through the density:
m = ρ * V, where ρ is the density of water equal to 1000 g / l.
V = m / ρ = 400 g / 1000 g / l = 0.4 l.
Let’s determine the volume of the resulting solution:
V (solution) = V (H2O) + V (in-va) = 0.4 + 5.6 = 6 liters.
Determine the volume fraction of acid in the solution:
w (v-va) = (V (v-va) / V (r-ra)) = (5.6 / 6) * 100% = 93.3%
Answer: in a solution of 93.3% hydrochloric acid.