Step-by-step 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