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Answer the following question.  The reaction between  0. 8051g KOH and  400.0 mL diluted sulfuric acid solution (the excess reagent)  was performed in the coffee cup calorimeter:  2 KOH(s) +  H2SO4 (aq)  => K2SO4 (aq) + 2H2O(l) Calculate  ΔHrxn  in kJ/molKOH, if the temperature was raised from 22.25oC to 30.65oC. Submit the answers in this exam. After submitting your exam, take the pictures of your work and upload them to Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Your work must reflect the answer provided here. NO CREDIT will be awarded for the answer without work or justification shown. Answer:  

Describe the life and actions of Bartolomé de las Casas.  What was his impact on the course of history?

Answer the following question.  A  25 L balloon contain 515 g of xenon at 127oC. Calculate the pressure in the balloon in atm. Chose your final answer here. After submitting the exam, upload the matching calculations to the Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Answer – 2pts, work – 2pts

Answer the following question.  18.3 g of KClO3 decomposes according to the following balanced equation. Use the stoichiometry and gas laws to determine the volume of O2 formed at 1 atm and 500K.  The molar mass for KClO3 is 122.55 g/mol.                 2 KClO3(s)  →  2 KCl(s) + 3 O2(g) Submit the answers in this exam. After submitting your exam, take the pictures of your work and upload them to Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Your work must reflect the answer provided here. NO CREDIT will be awarded for the answer without work or justification shown. Answer:

In the 20th century, many Latin American countries experienced reformist and revolutionary movements that tried expand rights to marginalized groups like women, peasants, and workers.  Our textbook described specific reforms that took place in Mexico, Argentina, Brazil, and Cuba.  Describe the reforms of TWO of these countries in as much detail as possible (covering an additional one or two countries can result in a higher-than-perfect score).

Answer the following question.  A  125 L balloon contains 715 g of helium at 0oC. Calculate the pressure in the balloon in atm. Chose your final answer here. After submitting the exam, upload the matching calculations to the Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Answer – 2pts, work – 2pts

Answer the following question.  Use the properties of enthalpy as a state function (version of Hess’s law) and  data below to calculate the enthalpy change for the given reaction (Hint: Do not forget about the coefficients)    Standard Enthalpies of Formation, in kJ/mol ΔHof     ΔHof NO(g)       +90.25           NO2(g)      +33.2        NH3(g)     -45.9          N2O(g)        81.6   H2O(l)        -285.8         H2O(g)         -241.8 Use the properties of enthalpy as a state function (version of Hess’s law) and  data above to calculate the enthalpy change for the reaction (Hint: Do not forget about the coefficients):                                         8 NO2(g)  + 6 NH3(g)  =>  7 N2O(g)  +  9 H2O(g)                      ΔH = ? Submit the answers in this exam. After submitting your exam, take the pictures of your work and upload them to Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Your work must reflect the answer provided here. NO CREDIT will be awarded for the answer without work or justification shown. Answer:    

Answer the following question.  A 164 g sample of neon is placed into a cylinder at 226oC and 332 atm. What is the volume of the cylinder in liters? Chose your final answer here. After submitting the exam, upload the matching calculations to the Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Answer – 2pts, work – 2pts

Answer the following question.  A  75.0 L balloon contains 215.18 g of neon at 27oC. Calculate the pressure  in the balloon in atm. Chose your final answer here. After submitting the exam, upload the matching calculations to the Exam 4 Solutions, Extra Credit, and Partial Credit assignment. Answer – 2pts, work – 2pts  

Answer the following question Use the Henderson-Hasselbalch equation to calculate the pH of the solution prepared by dissolving  0.55 mol of a weak acid (Ka=2.77×10-5) and 0.78 mol of its conjugate base in enough water to make 1.00L of buffer solution Chose your final answer here. After submitting the exam, upload the matching calculations to the Exam 3 Solutions, Extra Credit, and Partial Credit assignment. Answer – 4pts, work – 1pts