Which of the following statements describes the correct method of preparation of 1.00 l of a 2.0 m urea solution?
urea = 60.06 g/mol
a) dissolve 120 g of urea in 1.00 kg of distilled water.
b) dissolve 120 g of urea in 880 g of distilled water.
c) dissolve 120 g of urea in enough distilled water to produce 1.00 l of solution.
d) dissolve 120 g of urea in 1.00 liter of distilled water.
e) the density of urea is needed in order to do this calculation

To prepare 1.00 L of 2.0 M urea solution, we need to dissolve 120 g of urea in enough water to produce a total of 1.00 L solution

Explanation:

Molarity of a solute in a solution denotes number of moles of solute dissolved in 1 L of solution.

So, moles of urea in 1.00 L of a 2.0 M urea solution = 2 moles

We know, number of moles of a compound is the ratio of mass to molar mass of that compound.

So, mass of  2 moles of urea =

Therefore to prepare 1.00 L of 2.0 M urea solution, we need to dissolve 120 g of urea in enough water to produce a total of 1.00 L solution

So, option (C) is correct.

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