Step-by-step explanation:
Molarity is defined as the the number of moles present in a solution divided by volume in liters.
Mathematically, Molarity =

As it is given that number of moles present into the solution are 2.00 moles and volume is 4 liter. Therefore, calculate the molarity of solution as follows.
Molarity =

=

= 0.5 M
Thus, we can conclude that the concentration of given solution is 0.5 M.