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PL%20Worksheet%203 - 2 SO 4 solution 7 In another solution...

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PL Worksheet #3 Units of Concentration 13.5 A sample has 21.6 g of K 2 SO 4 dissolved in 1.25 L of water to make a solution that is 1.31 L. 1. What is the molarity of the compound in this sample? 2. What is the molality of the compound in this sample? Density of water is 1.00 g/mL. 3. What is the mole fraction of the solute compound in this sample? Of the solvent? 13.6 Colligative Properties Still using the description of good ole K 2 SO 4 solution from above: 4. What is the molarity of ions that are present?

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5. What is the boiling point of the solution? K b = 0.512 C-kg/mol, boiling pt of water = 100 C 6. What is the vapor pressure of the solution? The vapor pressure of pure water at the same temperature as the solution is 112.5 torr. The following questions no longer use the K
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Unformatted text preview: 2 SO 4 solution. 7. In another solution, 12.8 g of an unknown covalent compound is dissolved in 951 mL of water and creates an osmotic pressure of 2.95 atm at 20.0 Celsius. What is the molar mass of the compound? R = 0.0821 L-atm/mol-K 8. What is the freezing point of 12.5 g of C 2 H 6 dissolved in 855 g of carbon tetrachloride? The melting point of carbon tetrachloride is -23 Celsius and the K f = 30. C-kg/mol. 12.6 Solid-state properties 9. List one example of each type of solid (atomic, molecular, metallic, ionic and covalent network). 10. Describe why a covalent network solid has a much higher melting point than molecular solids, though both are made of covalent compounds....
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