Supplemental Instruction
Iowa State University / Leader: / Kara
Course: / Chem 163
Instructor: / Sadow or Woo
Date: / 11/11/13
Study Tip of the Day: When the pressure and stress of the semester begins to build and you can't imagine how you can possibly accomplish everything you need to do, make a list
1. Consider sulfuric acid, H2SO4
a) What is the molar mass of sulfuric acid?
b) What is the mass in grams of 2.5 moles of H2SO4?
2. A student runs a reaction to prepare 40.0 g of aspirin and yet recovers only 15.5 g. What is the percent yield?
3. Consider the unbalance chemical equation NO + O2 ---> NO2
a) Balance the equation
b) To produce 2 moles of NO2 by the reaction you just wrote, how many grams of NO and O2 must you combine?
c) What is the theoretical yield in grams of NO2?
d) You carry out the reaction and recover 22.5 g of NO2. What is the percent yield?
4. Consider the unbalanced chemical equation HCl + Zn ---> H2 + ZnCl2
a) Balance the equation
b) To produce one mole of H2 from the reaction you just wrote, how many grams of HCl and Zn must you combine?
c) What is the theoretical yield in grams of H2?
d) You recover 2.00 g of H2 after carrying out the reaction. What is the percent yield?
5. Chlorine (Cl2) and fluorine (F2) react to form ClF3. A reaction vessel is charged with 2.5 moles of Cl2 and 6.15 moles of F2.
a) Write a balanced chemical equation for this reaction.
b) Which reactant is limiting?
c) What is the theoretical yield for this reaction in moles?
d) What is the theoretical yield for this reaction in grams?
6. 5.00 g of solid sodium (Na) and 30.0 g of liquid bromine (Br2) react to form solid NaBr.
a) Write a balanced chemical equation for this reaction.
b) Which reactant is limiting?
c) What is the theoretical yield for this reaction in moles?
d) When this reaction is actually performed, 14.7 g of NaBr is recovered. What is the percent yield of the reaction?
7. Butane (C4H10) reacts with oxygen (O2) to produce CO2 and H2O. Suppose 10.00 g butane is combined with 10.00 g O2.
a) Write a balanced equation for the combustion of butane.
b) Which reactant is limiting?
c) What is the theoretical yield of each product for this reaction in grams?