CHM 1025stoichimoetry problem set

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CHM1025 Brewer Stoichiometry and Chemistry in Solutions These problem sets are designed to walk you through step by step of how I would think to approach these problems if I were to encounter them... and need to solve them. All parts of the problem are required to receive credit. You must show ALL work and include ALL units in your work and calculations. The final answer alone without showing your work is worth no credit, even if it is correct. The majority of these questions come from old exams that I have written. If you can come up with another method to solve the problem I encourage you to include that as well! Remember, on an exam you won’t have the ability to copy someone else’s assignment, so it is to your learning advantage to exercise independent thought on this assignment. 1. Consider the combustion reaction of propane gas. What would be the theoretical yield of CO2 (in grams) if we begin with 100 g of propane and 100 g of oxygen gas? a. Write a balanced chemical equation. b. How much CO2 could you make if all of the propane reacts? c. How much CO2 could you make if all of the oxygen gas reacts? d. What is your limiting reagent? What is your theoretical yield? e. If only 12.0 g of CO2 could be collected, what is the percent yield for this reaction? https://www.coursehero.com/file/15643595/stoichimoetry-problem-set/ This study resource was shared via CourseHero.comCHM1025 Brewer 2. In the elephant toothpaste demonstration it is an example of decomposition of hydrogen peroxide (H2O2) to water and oxygen gas. This process has a ΔH = -196 kJ/mol (exothermic). Hydrogen peroxide is supplied as a 30% (m/m) solution in water with a solution density = 1.11 g/mL. How much energy is released when using 80 mL of your hydrogen peroxide solution? (Assume it all will decompose) a. Solve for the Molarity of the 30% (m/m) solution of H2O2. b. Write a balanced chemical equation for the decomposition of hydrogen peroxide. Be sure to properly incorporate the enthalpy into the equation. c. Write out conversion factors that relate the following: amount of H2O2 to volume of stock H2O2 solution, H2O2 and enthalpy. d. Using the information that you have obtained in the previous parts, solve the original problem. https://www.coursehero.com/file/15643595/stoichimoetry-problem-set/ This study resource was shared via CourseHero.comCHM1025 Brewer 3. You use 58 mL of 0.615 M calcium hydroxide (assume soluble) to titrate 83 mL of a solution of hydrochloric acid of unknown concentration. How much concentrated hydrochloric acid would you need to prepare 83 mL more of your unknown hydrochloric acid solution? Hydrochloric acid is supplied as a concentrated solution that is a 37% (m/m) solution in water with a solution density of 1.19 g/mL. a. Write a balanced chemical equation for the titration reaction that is occuring. b. Determine the concentration of the unknown sample of HCl using proper dimensional analysis and taking care to include your units. c. What is the concentration of the 37% (m/m) HCl solution in units of Molarity? d. What volume of the concentrated HCl solution would you need to prepare 83 mL of the sample that you solved for in part b? https://www.coursehero.com/file/15643595/stoichimoetry-problem-set/ This study resource was shared via CourseHero.com Powered by TCPDF (www.tcpdf.org) [Show More]

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