The following experiment is carried out in a physiology lab. Red blood cells are placed in different solutions: distilled water, 0.45% saline, 0.9% saline, 5% urea, and 5% glucose. The molecular mass for each molecule is given: NaCl = 58.44 gm/mole; urea = 60.06 gm/mole; glucose = 180.16 gm/mole.
For each of the solutions used, calculate the osmolarity. To do this, you will need to convert solutions given in percents to osmolarity. A 0.45% saline solution has 0.45 gm/100 mL NaCl, or 4.5 gm/L. The same is true for the other molecules.
Fill in the osmolarity of each solution to the nearest integer using the choices provided.
Distilled water = ... mOsm
0.45% saline = ... mOsm
0.9% saline = ... mOsm
2.0% urea = ... mOsm
5% glucose = ... mOsm