The osmotic pressure of human blood is precisely at . What must be the exact number of moles of gluc — Solutions and Colligative Properties Chemistry Question
Question
The osmotic pressure of human blood is precisely $7.40\text{ atm}$ at $27^\circ\text{C}$. What must be the exact number of moles of glucose ($C_6H_{12}O_6$) dissolved per litre for an intravenous injection to be perfectly isotonic with blood?
Answer: C
💡 Solution & Explanation
$\pi = CRT \implies 7.40 = C \times 0.0821 \times 300$. Solving for $C$ gives $C = \frac{7.40}{24.63} \approx 0.30\text{ mol L}^{-1}$. Since glucose is a non-electrolyte, its molarity is its effective concentration.
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