Answer: 3.33M
Explanation: Molarity : It is defined as the number of moles of solute present in one liter of solution.
Formula used :

where,
n = moles of solute = 2.5 moles
= volume of solution in ml= 750 ml
Now put all the given values in the formula of molarity, we get

Therefore, the molarity of solution is 3.33 M.