Chapter U4.81, Problem 1TAI

Interpretation Introduction

Interpretation:

The use of molarity to calculate the moles of solute must be explained.

Concept introduction:

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

Answer to Problem 1TAI

Moles of solute can be found from the molarity of the solution and the volume of the solution.

Explanation of Solution

Let’s consider a 2 M urea solution. Moles of urea must be found in 500 mL of the solution.

Molarity of urea solution is 2 means 1 L solution contains 2 moles of urea.

So, 500 mL or 0.5 L solution contains $2\times 0.5=1\text{ mole of urea}$ .

Thus, from molarity and volume of the solution, moles of solute can be found out.

Conclusion

Molarity and volume of solution can be used to find out the moles of solute.