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# Calculation: Isotonic Solutions

CHEM-UYQEUJ

What molarity of sodium chloride in water is needed to produce an aqueous solution isotonic with blood at normal 37.0 °C ($\Pi$ = 7.65 atm)?

The dependence of osmotic pressure on solution concentration is represented by the equation $\Pi = MRT$

...where $\Pi$ is osmotic pressure, $M$ is molarity, $R$ is the molar gas constant, and $T$ is temperature.

A

0.00297 mol/L

B

0.0249 mol/L

C

0.301 mol/L

D

2.52 mol/L