Question

What is the molarity of a methanol solution that contains 25 g of methanol in 3.5 L of a
solution? (Methanol = 32 g/mol)
2.7 M
O 0.22M
4.48 M
O 0.0044M

Answer 1

Molarity of methanol is 0.223 M.

Explanation:

We need to find the molarity of methanol by using the given mass and volume in litres by finding its moles using the given mass and molar mass and then using the moles and volume, we can find the molarity of the solution.

Molarity = $\frac{moles}{volume(L)}$

Moles = $\frac{given mass}{molar mass}$

       = $\frac{25 g}{ 32 g/mol}$

       = 0.78 moles

Now, we can find the molarity as,

$molarity = \frac{0.78 moles}{3.5 L}$

             = 0.223 M

So the concentration of methanol solution is 0.223 M.