Question

What is the numerical value of the molarity of a solution containing 122 g of MgSO4 in 3.5 L of solution?Answers to choose:•0.550•0.630•0.300•0.290

Answer 1

Explanation:

Molarity, or concentration in amount of matter (mol/L), is the ratio between the amount of matter in the solute (n) and the volume of the solution in liters (V): M = n/V

Here we have:

m - 122 g

V = 3.5 L

Let's transform 122 g into moles using the following formula:

n = m/MM

MM of MgSO4 = 120 g/mol

n = 122/120

n = 1 mol

so:

M = 1/3.5

M = 0.29 M

Answer: 0.290