Calculate the osmotic pressure of each of the following aqueous solutions at 20.00°C?
2019-02-24 10:55 pm
29.5 mL of glycerol (C3H8O3) in 250.0 mL of aqueous solution (density of glycerol = 1.265 g/ml):
回答 (1)
2019-02-25 12:05 am
Molar mass of C₃H₈O₃ = (12.0×3 + 1.0×8 + 16.0×3) g/mol = 92.0 g/mol
Molarity, M = [(2.95 mL) × (1.265 g/mL) / (92.0 g/mol)] / (250.0/1000 L) = 0.1623 mol/L
Gas constant, R = 0.08206 L atm / (mol K)
Temperature, T = (273 + 25) K = 298 K
Π = MRT
Osmotic pressure, Π = 0.1623 × 0.08206 × 298 atm = 3.97 atm (to 3 sig. fig.)
Molarity, M = [(2.95 mL) × (1.265 g/mL) / (92.0 g/mol)] / (250.0/1000 L) = 0.1623 mol/L
Gas constant, R = 0.08206 L atm / (mol K)
Temperature, T = (273 + 25) K = 298 K
Π = MRT
Osmotic pressure, Π = 0.1623 × 0.08206 × 298 atm = 3.97 atm (to 3 sig. fig.)
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