I. Conversion and Dimensional Analysis 1. Convert 10.0 g-/ to kg-/. 2. The total amount of...
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I. Conversion and Dimensional Analysis 1. Convert 10.0 g-/ to kg-/. 2. The total amount of fresh water on earth is estimated to be. What is this volume in cubic meters? In liters? 3. The ideal gas constant was experimentally found to be 8.3 J/(K- mol). At a temperature of 300 K, how much energy (in J) would a sample of atoms of water contain? 4. Winnipeg is refilling the pool. How many gallons of water will it take if the pool is 50m by 25m by 1.5m? (1 = gallon 3.786 L) II. Electrochemistry (Nonstandard Voltage and Electrolytic Cells) 1. Calculate the cell potential for a voltaic cell with Pt/Pt2+ and Ag/Ag+ half-cells and the initial concentrations [] = 0.90 M and [] = 0.20 M. (aq) + 2e- > Pt(s) (aq) + e- Ag(s) E = +1.20 V E = +0.80 V 2. Copper metal (63.546 g/mol) is purified by electrolysis. How much copper metal (in grams) could be produced from copper (II) oxide by applying a current of 10 amperes at the appropriate negative potential for 12 hours? Half-equation: + 2e Cu (s) 3. Chromium often is electroplated on other metals and even plastics to produce a shiny metallic appearance. How many grams of chromium (51.996 g/mol) would plate out from a solution of when 10 amps of current are passed through the electrolytic cell for 5.36 hours? Half-equation for Chromium: +3e Cr(s) I. Conversion and Dimensional Analysis 1. Convert 10.0 g-/ to kg-/. 2. The total amount of fresh water on earth is estimated to be. What is this volume in cubic meters? In liters? 3. The ideal gas constant was experimentally found to be 8.3 J/(K- mol). At a temperature of 300 K, how much energy (in J) would a sample of atoms of water contain? 4. Winnipeg is refilling the pool. How many gallons of water will it take if the pool is 50m by 25m by 1.5m? (1 = gallon 3.786 L) II. Electrochemistry (Nonstandard Voltage and Electrolytic Cells) 1. Calculate the cell potential for a voltaic cell with Pt/Pt2+ and Ag/Ag+ half-cells and the initial concentrations [] = 0.90 M and [] = 0.20 M. (aq) + 2e- > Pt(s) (aq) + e- Ag(s) E = +1.20 V E = +0.80 V 2. Copper metal (63.546 g/mol) is purified by electrolysis. How much copper metal (in grams) could be produced from copper (II) oxide by applying a current of 10 amperes at the appropriate negative potential for 12 hours? Half-equation: + 2e Cu (s) 3. Chromium often is electroplated on other metals and even plastics to produce a shiny metallic appearance. How many grams of chromium (51.996 g/mol) would plate out from a solution of when 10 amps of current are passed through the electrolytic cell for 5.36 hours? Half-equation for Chromium: +3e Cr(s)
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