Title: Calculating Molarity: Practice Quiz #3C (optional)
Course: BTEC-1100-301-302-303-F21 > Section: Module 1 - Calculations and Measurements

Q: You need to make 400 mL of a 300 mM solution of a chemical with a FW of 131.6. Â How many grams of the chemical do you need?
- 15.79
- 15792
- 15792000
- 1.5792
A: 15.79
If right: Correct!
If wrong: That is incorrect. Recall that 1000 mL = 1 L, mM = mmol/L, 1000 mmol = 1 mol, and the units for FW are g/mol. Set up the problem so that everything except for grams will cancel out.

Q: What is the molarity of a solution that contains .5 mol of solute in a total volume of .1 L?
- 5
- 50
- 0.5
A: 5
If right: Correct!
If wrong: That is incorrect. Recall that M = mol/L.

Q: What is the molarity of a solution that contains 1.25 mol of solute in a total volume of 1.5 L?
- 0.83
- 8.33
- 0.08
A: 0.83
If right: Correct!
If wrong: That is incorrect. Recall that M = mol/L.

Q: What is the molarity of a solution that contains .5 mol of solute in a total volume of 2 L?
- 0.25
- 2.5
- 0.03
A: 0.25
If right: Correct!
If wrong: That is incorrect. Recall that M = mol/L.