Question

What is the molarity of 2 moles of a compound dissolved in 4 L of water?

A. 2 M
B. 0.5 M
C. 4M
D. 1 M

Answer 1

`\boxed {\boxed {\sf B. \ 0.5 \ M}}`

Step-by-step explanation:

Molarity is a measure of concentration in moles per liter. The formula for calculating molarity is:

`molarity= (moles \ of \ solute)/( liters \ of \ solution)`

There are 2 moles of a compound or the solute. There are 4 liters of water or the solution.

• moles of solute= 2 mol
• liters of solution = 4 L

Substitute the values into the formula.

`molarity = ( 2 \ mol)/( 4 \ L)`

Divide.

`molarity= 0.5 \ mol /L`

1 mole per liter is equal to 1 Molar, so the solution's molarity of 0.5 mol/L is equal to 0.5 M.

`molarity = 0.5 \ M`

The molarity of the solution is 0.5 Molar and choice B is correct.