Physiology 31 – Unit 1 Calculations Worksheet
Solve the following problems, and be sure to show your work.
Part I: Manipulation and Analysis of Data
Percent = part of something x 100%
whole
Example: 25 out of 100 = 25_ = 0.25; 0.25 x 100 = 25%
100
5 x 100 = 500%
1. Change the following to percents (multiply by 100)
a. 38
b. 1.6
c. 0.75
2. Change the following percents to whole numbers or decimals (remove the % sign and divide by 100)
a. 805%
b. 0.05%
c. 10%
Part II: Metrics
1. How many grams are equal to 374 mg?
2. How many mg are equal to 29 g?
3. How many liters are equal to 7870 ml?
4. How many ml are equal to 35 L?
Part III: Molarity
Molecular weight = grams/mole or MW = g/mol
Molar = moles/liter or M = mol/L
Molecular weight of
Glucose = 180 g/mol
NaCl = 58.5 g/mol
CaCl2 = 110 g/mol
1. How many grams of glucose are in 5 moles?
2. How many moles of glucose are in 5 grams?
3. To make 0.5 L of a 3M saline solution, how many grams of NaCl would you use?
4. How many grams of NaCl would you use to make a 4M solution in 100 ml?
5. How many grams of glucose would you use to make 200 ml of a 1M sugar solution?
6. How many grams of glucose would you use to make a 2M solution in 1 L?
7. How many grams of CaCl2 would you use to make 200 ml of a 2mM calcium salt solution?
8. How many grams of CaCl2 would you use to make 500 ml of a 6mM calcium salt solution?
9. If you use 100 g of glucose in 0.5 L of H2O, what molar concentration is the sugar solution?
10. What is the molar concentration of a sugar solution made of 50 g glucose in a total volume of 1 L?
11. If you use 2000 mg of NaCl in 50 ml of H2O, what molar concentration is the saline solution?
12. What is the molar concentration of a saline solution made of 20 g of NaCl in a total volume of 100 ml?
13. How would you make 1 L of a 2% NaCl solution?
14. How would you make 100 ml of a 5% NaCl solution?
15. How would you make 2L of a 10% glucose solution?
16. How would you make 400 ml of a 3% glucose solution?
17. What is the percent solution if you put 3000 mg of CaCl2 in 100 ml of H2O?
18. If you put 50 g of CaCl2 in 100 ml H2O, what is the percent solution?
19. If you have a 20% glucose solution, what is the molar concentration?
20. What is the molar concentration of a 5% glucose solution?
21. If you have a 2.5M NaCl solution, what is the percent concentration?
22. What is the percent concentration of a 6M solution of NaCl?
If you have 250 ml, 500 ml, 1.0 L, and 2.0 L flasks:
23. Which one(s) would you use to make 1.0 L of a solution?
24. Which one(s) would you use to make 100 ml of a solution?