Concentrated hydrochloric acid is made by pumping hydrogen chloride gas into distilled water. If concentrated HCl contains 439 g of HCl per liter, what is the molarity?

12.10 mol / 1 L

Explanation:

Molarity of a substance, is the number of moles present in a liter of solution.

M = n / V

M = molarity (unit = mol / L or M)

V = volume of solution in liter (unit = L),

n = moles of solute (unit = mol),

Moles is denoted by given mass divided by the molecular mass,

Hence,

n = w / m

n = moles,

w = given mass,

m = molecular mass.

From the question,

The data given is as follows -

w = 439 g

As, we known for HCl,

m = 36.46 g/mol

V = 1 L

From the above data,

Moles are given as -

n = w / m

n = 439 / 36.26 = 12.10 mol,

Now, the molarity is given as,

M = n / V

M = 12.10 mol / 1 L

M = 12.10 mol / L