# A solution of hydrochloric acid is 37.2% HCl. Express this concentration in molarity and mole...

## Question:

A solution of hydrochloric acid is 37.2% HCl. Express this concentration in molarity and mole fraction, and molarity (density of the solution is 1.034 g/mL).

## Solution Concentration Units:

If we wish to express the amount of solute that is dissolved in a solution, we must use solution concentration units. In terms of moles, we can opt to write the concentration of the solution in terms of:

• Molarity (M)
• Molality (m)
• Mole Fraction (X)

Molarity and molality are similar as both express the amount of solute. However, molarity is moles per liter while molality is moles per kg of solvent. The mole fraction is the ratio of the moles of solute and the total moles of the solution.

## Answer and Explanation: 1

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#### Molarity

To begin, we can assume that we 100 g of solution for convenience. This means we can take the mass percent of HCl to be the mass of HCl...

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