# Calculate the osmotic pressure of a solution containing 19.80 mg of hemoglobin in 13.0 mL of solution at 34 ∘C.?

The molar mass of hemoglobin is 6.5×104gmol−1.

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- 冷眼旁觀Lv 79 months agoFavourite answer
van't Hoff index for hemoglobin, i = 1

molarity, M = [(19.80 × 10⁻³ g) / (6.5 × 10⁴ g mol⁻¹)] / (13.0 × 10⁻³ L) = 2.343 × 10⁻⁵ mol/L

gas constant, R = 0.08206 L atm mol⁻¹ K⁻¹)

temperature, T = (273 + 34) K = 307 K

Osmotic pressure, Π = iMRT = 1 × (2.343 × 10⁻⁵) × 0.08206 × 307 = 5.90 × 10⁻⁴ atm

(Take R = 8.314 J mol⁻¹ K⁻¹, Π = 0.0598 Pa)

(Take R = 62.36 L torr mol⁻¹ K⁻¹, Π = 0.449 torr = 0.449 mmHg)

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- Anonymous9 months ago
Dude that’s easy. It’s 12

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