Question

PLEASE HELP FAST!! How many moles are contained in 500 mL of a 3.5M NaOH solution?

Answer 1

Answer:

1.75 moles are contained in 500 mL of a 3.5 M NaOH solution.

Explanation:

Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.

$Molarity=\frac{number of moles of solute}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$.

In this case:

• molarity= 3.5 M
• number of moles of solute= ?
• volume= 500 mL= 0.5 L

Replacing:

$3.5 M=\frac{number of moles of solute}{0.5 L}$

Solving:

number of moles of solute= 3.5 M*0.5 L

number of moles of solute= 1.75 moles

1.75 moles are contained in 500 mL of a 3.5 M NaOH solution.