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

Q: You need to make 1.65 L of a 1.2 M solution of a chemical with a FW of 73.6. Â How many grams of the chemical do you need?
- 145.73
- 1457
- 14.5728
- 14572.8
A: 145.73
If right: Correct!
If wrong: That is incorrect. Recall that M = mol/L, and the units for FW are g/mol. Set up the problem so that everything except for grams will cancel out.

Q: You need to make 1.5 L of a 1.3 M solution of a chemical with a FW of 131.6. Â How many grams of the chemical do you need?
- 256.62
- 2566
- 25.662
- 25662
A: 256.62
If right: Correct!
If wrong: That is incorrect. Recall that M = mol/L, and the units for FW are g/mol. Set up the problem so that everything except for grams will cancel out.

Q: You need to make 1 L of a 50 mM solution of a chemical with a FW of 58.4. Â How many grams of the chemical do you need?
- 2.92
- 2920
- 292
- 29.2
A: 2.92
If right: Correct!
If wrong: That is incorrect. Recall that 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: You need to make 900 mL of a 800 mM solution of a chemical with a FW of 131.6. Â How many grams of the chemical do you need?
- 94.75
- 94752
- 94752000
- 9.4752
A: 94.75
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.