Old Final - CHM 2046 Gower Sections Final Exam(Form Code A Fall 2009 Instructions On your scantron sheet enter and bubble in your name UF ID

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CHM 2046 Gower Sections Final Exam (Form Code A) Fall 2009 Instructions: On your scantron sheet enter and bubble in your name , UF ID number (start on the leftmost space and leave any extra spaces blank), and Form Code (see above). Turn in only your scantron. Check your bubbling carefully – bubbling errors will not be negotiated . Note: The double-arrow symbol used in this exam ( ↔) refers to a reversible reaction. Potentially Useful Information: K w = 1.0 x 10 –14 R = 0.0821 lit•atm/mol•K and 8.314 J/mol•K 1 A = 1 C/s 1 F = 96,500 C/mol e –- c = 3.00 x 10 8 m/s 1 kg = 6.022 x 10 26 amu 1 J = 1 kg•m 2 /s 2 1. The equilibrium constant K c for the reaction I 2 (g) ↔ 2I is 3.8 x 10 –5 at 727ºC. What is the K c for the reaction 2I(g) ↔ I 2 (g) at the same temperature? (1) 2.6 x 10 4 (2) 1.4 x 10 –9 (3) 1.9 x 10 –5 (4) 3.8 x 10 –5 (5) 6.8 x 10 3 2. Consider the following equilibrium in a closed container: C (graphite) + 2H 2(g) CH 4(g) Δ H º = –75 kJ An increase in temperature will…. (1) decrease the partial pressure of H 2 , increase the partial pressure of CH 4 , and increase the K p (2) decrease the partial pressure of H 2 , increase the partial pressure of CH 4 , and decrease the K p (3) increase the partial pressure of H 2 , decrease the partial pressure of CH 4 , and increase the K p (4) increase the partial pressure of H 2 , decrease the partial pressure of CH 4 , and decrease the K p (5) decrease the partial pressure of H 2 , increase the partial pressure of CH 4 , and K p will stay the same 3. Calculate the mass (in grams) of solid benzoic acid (C 6 H 5 COOH) you would need, in order to prepare 1.0 liter of benzoic acid/benzoate buffer of pH 4.00, using a stock 0.050 M sodium benzoate (C 6 H 5 COONa) solution. The K a of benzoic acid is 6.3 x 10 –5 . (1) 13 g (2) 9.7 g (3) 7.4 g (4) 5.3 g (5) 2.4 g 4. Calculate the mass (in mg) of sodium acetate (CH 3 COONa) needed to make 200. mL of aqueous CH 3 COONa solution with a pH of 8.00. The K b of CH 3 COO = 5.6 x 10 –10 . (1)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/25/2011 for the course CHM 2046 taught by Professor Veige/martin during the Fall '07 term at University of Florida.

Page1 / 2

Old Final - CHM 2046 Gower Sections Final Exam(Form Code A Fall 2009 Instructions On your scantron sheet enter and bubble in your name UF ID

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online