Your solution's molality is
Determine the number of moles of urea you have by using its molar mass
All you have to do now is plug in your values
Don't forget to convert grams of water to kilograms of water, because the formula asks for kilograms of solvent.
The molality is 0.712 m.
In order to determine the molality of a solution, you need to do the following:
Step 1. Calculate the number of moles of solute by converting the mass in grams of urea to moles using its molar mass, which is
Step 2. Calculate the number of kilograms of solvent. The mass of the solvent (water) is
Step 3. Divide moles of solute by kilograms of solvent.