Exam 1 clean

Exam 1 clean - For HCN K a = 6.2 × 10-10 50.0 mL of 0.10 M...

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Chem 32: Hour Exam #1 Feb 23, 2011 Name: __________________________ Date: _____________ 10 points for each question. Show your work to obtain partial credits. 1. At 200 K, the molecules or atoms of an unknown gas, X, have an average velocity equal to that of Ar atoms at 400 K. What is X? (Assume ideal behavior and show your steps to reach the conclusion) A) He B) CO C) HF D) HBr E) F 2 Page 1
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2. A cylinder of oxygen gas contains 26.4 g of O 2 . Another cylinder, twice the volume of the cylinder containing oxygen (and at the same conditions of pressure and temperature), contains CO 2 gas. Assuming ideal behavior, what is the mass of the carbon dioxide?
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3. For ammonia, K b is 1.8 × 10 -5 . To make a buffered solution with pH 10.0, the ratio of NH 4 Cl to NH 3 must be Page 3
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4. A 50.00-mL sample of 0.100 M KOH is titrated with 0.100 M HNO 3 . Calculate the pH of the solution after the 52.00 mL of HNO 3 is added.
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5. Calculate the pH of the final solution obtained by mixing the following solutions.
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Unformatted text preview: For HCN, K a = 6.2 × 10-10 . 50.0 mL of 0.10 M HNO 3 60.0 mL of 0.20 M Ba(OH) 2 95.0 mL of 0.20 M HClO 4 195.0 mL of 1.0 × 10-4 M HCN Page 5 6. How many moles of Ca(NO 3 ) 2 must be added to 1.0 L of a 0.14 M HF solution to begin precipitation of CaF 2 ( s )? For CaF 2 , K sp = 4.0 x 10 –11 . 7. What is the solubility of Mg(OH) 2 ( K sp = 8.9 × 10 –12 ) in 1.0 L of a solution buffered (with large capacity) at pH 10.0? Page 7 8. A sample of helium gas has been contaminated with argon gas. At 1 atm and 25°C, the density of the mixture is 0.200 g/L. What is the volume percent argon in the sample? Assume ideal behavior. 9. A solution is made by mixing equal volumes of 0.20 M HCN ( K a = 6.2 × 10-10 ) and 0.20 M NH 3 ( K b = 1.8 × 10-5 ). Determine the pH of the solution. Page 9 10. Determine the pH of a solution made by adding 1.0 × 10-7 mol of HCl to 1.0 L of solution....
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Exam 1 clean - For HCN K a = 6.2 × 10-10 50.0 mL of 0.10 M...

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