What is true of a solution of 1.0 M HCl (aq) ?

It contains 1.0 mole of HCl per 1 liter of solution.

Explanation:

The answer choices for this question are:

It contains 1.0 gram of HCl per 100 grams of water. It contains 1.0 gram of HCl per 1 liter of solution. It contains 1.0 mole of HCl per 100 milliliters of water. It contains 1.0 mole of HCl per 1 liter of solution.

Solution

The M at the end of the expression 1.0 M is the unit of concentration of the solution.

It means molar. This is, the solution is 1.0 molar.

Molar is the unit of concentration used for molarity.

It is defined as the number of moles of solute per liter of solution. Thus, 1.0 M is equal to 1.0 mol/liter, meaning that the solution contains 1.0 mole per 1 liter of solution (the last statement from the choices.