A blood cell is isotonic 03 osM in a solution with 001 NaCl

A blood cell is isotonic (0.3 osM) in a solution with 0.01% NaCl. What is the internal concentration of the cell in gmol/L?

Solution

Concentration can be expressed as g/L or mol/L; not gmol/L.

Since the cell is isotonic with 0,01% NaCl, its concentration is assumed to be identical.

0.01% = 0.01 g/ 100 mL, i.e. 0.1 g/L or (0.1/58.5) = 0.0017 mol/L