Answer to Question #103347 in General Chemistry for Beverlie

Question

1. A 15.0 mg sample of a protein was dissolved in water to produce 5.00 mL of solution at 25.1 oC. The osmotic pressure of this solution was measured and found to be 6.50 torr. What is the molar mass of this protein?
2. ) Calculate the molality of a solution containing 0.575 mol of ethanol (CH3CH2OH) and 395 g of water.
3. ) A solution is prepared by mixing 45.68 g of carbon disulfide (CS2, 76.13 g/mol) with 16.42 g of acetonitrile (CH3CN, 41.06 g/mol). What is the partial pressure of CS2 in the vapor phase at 25C?
Substance Vapor Pressure at 25C (torr)
Carbon disulfide 357
Acetonitrile 89.5
4. What is the boiling point of a solution prepared by dissolving 10.00 g of naphthalene (C10H8, 128.17 g/mol) in 200.0 g of benzene (C6H6, 78.12 g/mol)? The normal boiling point of benzene is 80.1C and Kb  2.53C/m.

Answer 1

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