Molarity of .100 mole of urea (CH4N2O) in 250.0 mL of solution

M= moles/L soln.

You have moles (0.1) and you have liters (0.250L). What more do you want?

To calculate the molarity (M) of a solution, you need to know the amount of solute (in moles) and the volume of the solution (in liters).

Given:
Amount of solute = 0.100 moles
Volume of solution = 250.0 mL = 0.250 L

To calculate molarity, divide the amount of solute by the volume of the solution:

Molarity (M) = Amount of solute (moles) / Volume of solution (L)

Plugging in the values:

Molarity (M) = 0.100 moles / 0.250 L

Now, let's calculate this:

Molarity (M) = 0.40 M

Therefore, the molarity of 0.100 moles of urea (CH4N2O) in 250.0 mL of solution is 0.40 M.