4-11 Molarity Calculations

1. 3.0g of a substance is dissolved in water. The volume of this solution is 40.0ml. What is the molarity of the solution? (The molecular weight of the substance is 63.4g/mol.)

2. A student is performing an experiment with 30.0ml of an unknown solution that has a molarity of 5.0M. How many moles are present in the unknown solution?

3. 2.5g of a substance is dissolved in water. The molarity of the solution is 3.0M. What is the volume of the solution? (The molecular weight of the substance is 102.4g/mol.)

4. An unknown amount of an unknown is dissolved in water. The molarity of the solution is 3.0M. The volume of the solution 50.0ml. What is the mass of the substance? (The molecular weight of the substance is 95.1g/mol.)