0.85% aqueous solution of N a N O 3 is apparently 90% dissociated. The osmotic pressure of solution at 300 K is

Question

0.85% aqueous solution of N a N O 3 is apparently 90% dissociated. The osmotic pressure of solution at 300 K is, 4.674 atm, 46.74 atm, 2.46 atm, 4.674 mm Hg

MARKS App · Accepted Answer

M = W × 1000 m o l . w t . × V Molarity = 1000 c m 3 × 0.85 g 100 c m 3 × 85 g m o l - 1 = 0.1 m o l L - 1 N a N O 3 → N a + + N O 3 - So i = 1 - α + α - α 1 = 1 + α = 1 + 0.90 = 1.90 π = i C R T = 1.90 × 0.1 × 0.082 × 300 = 4.674 atm.

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