University:
Cameron University
Course:
1364 | General Chemistry I
Academic year:

2024
Views:

216

Pages:

3
Author:

Kristopher Elliott

Dimensional Analysis I. Using Single Conversion factor: Example: A patient has 142 pounds weight. How many Kg is this? Given: pounds Wants: Kg 1) Conversion Factor 1 Ib = 0.454 Kg 2) Use the Conversion Factor Ratio (C.F.R.): 1 Ib 0.454 Kg 3) 0.454 Kg 1 Ib Or Make the equation: Given data  C.F.R  Wants 4) Results: 142 Ib  II. 0.454 Kg 1 Ib  64.5 Kg Using Multiple Conversion factors: Example: A nurse needs to give 25 mg of medicine to her patient. The pharmacist has provided a liquid solution of medicine contains 1.6 drams per liter. How many mL of liquid should the nurse administer? Given: 25 mg, 1.6 drams/L medicine (Drams: A unit of apothecary weight) Wants: mL of medicine 1) Conversion Factors: 1 grams = 1000 mg 1 drams = 3.89 grams 1 L = 1000 mL 2) Use the Conversion Factor Ratio (C.F.R.): 1000 mg 1g , 1g 1000 mg 3) , 1 dr 3.89 g , 3.89 g 1L , 1 dr 1000 mL , 1000 mL 1L Make the equation: 1g 1 dr 1L 1000 mL     4.0 mL 1000 mg 3.89 g 1.6 dr 1L 25 mg  4) 1g 1 dr 1L 1000 mL 25 mg      4.0 mL 1000 mg 3.89 g 1.6 dr 1L Example: A 216 lb., patient needs 40g/Kg medicine. The medicine is available in solution in concentration 0f 0.25 mg/mL. What volume of drug (in mL) is needed in the initial dose? Given: 25 mg, 1.6 drams/L medicine (Drams: Wants: mL of medicine 1) A unit of apothecary weight) Conversion Factors: 1 lb. = 0.454 Kg 1 g = 106 g 1 mg = 1000 g 1 Kg = 1000 grams 1 L = 1000 mL 2) Use the Conversion Factor Ratio (C.F.R.): 0.454 Kg 1 Ib 3) , 1 mg 1000 g Make the equation: , 1000 mL 1L 216 Ib  0.454 Kg 40 g 1 mg 1 mL     15.7 mL 1 Ib 1 Kg 1000 g 0.25 mg Example: Area & Volume Calculation: Convert 23.5 in2 to metric units (cm2). 1 inch = 2.54 centimeters 1 in2 = (1 in X 1 in) = (2.54 cm x 2.54 cm) = 6.45 cm2 6.45 cm 2 23.5 in   152.0 cm 2 2 1 in 2 Note: Volume  L  W  H Temperature Units: Fahrenheit (F), Centigrade (C) 32 F 0 C 212 F 100 C Water freezes at (sea level): Water boils at (sea Level) F  32 180 Or:  C 100 F  1.8 C  32 And: Kelvin = C + 273.15