chemistry Hw
mr.bra
chem115_spring2014_exam3_reviewsheet_stoichandgaslaws-2.docxChemistry 115
Spring 2014
Exam 3
Review sheet
Chapter 10: Stoichiometry
Topics:
Conversions – mass mol; volume mol; molar mass, molarity, conversions between various units of reactants vs. reactant, reactants vs. products etc.; Limiting and excess reactants; Percent yield; amount of excess reactant left over, solution stioichiometry
1. How many moles of carbon dioxide will be produced by the complete reaction of 2.0 mol of glucose (C6H12O6)?
C6H12O6 + O2 CO2 + H2O
2. How many moles of ammonia will be produced by the complete reaction of 8.00 mol of hydrogen gas with nitrogen gas?
3. How many moles of aluminum hydroxide are required to produce 22.0 mol of water?
Al(OH)3 + H2SO4 Al2(SO4)3 + H2O
4. Aluminum and oxygen react to form aluminum oxide by the equation
___Al(s) + ___O2(g) ___Al2O3(s)
In a certain experiment, 137 g of Al2O3 are produced from 75.6 g of Al and 124 g of O2.
a. What is the theoretical yield of Al2O3?
b. What is the percent yield of Al2O3?
5. How much of a 0.113M NaOH solution will be required to completely neutralize 1.25L of 0.228M HCl solution. (Ans: 2.52 L)
6. What is the minimum amount of 6.0M H2SO4 solution that is necessary to produce 15.0g of H2(g) according to the following reaction: (Ans: 1.2L)
Al(s) + H2SO4(aq.) Al2(SO4)3(aq) + H2(g)
Chapter 11: Gas laws
· Explaining behavior of gases based on kinetic molecular theory
· Boyle’s/ Charles’s / Combined gas laws/ Relationship between Pressure; Volume; Temperature and moles of a gas.
· Temperature in Kelvin
· Ideal gas law
· Partial pressures/vapor pressure
· Standard temperature and pressure
· Gases in reaction/ molar ratios
Examples:
1. When the volume of one mole of CO2 gas is maintained constant, what effect does heating the gas have on (please answer with a brief reason): (10 points)
1. it’s pressure?
1. the average kinetic energy of its molecules?
1. its mass?
1. the bond length or bond angle of its molecules?
1. A sample of N2 gas occupies a volume of 125 L at 20.0ºC. If the pressure remains constant, what will be the new volume when the temperature changes to 1085 K
1. A sample of propane gas was collected over water at 22.5ºC and 745 torr. The volume of the wet gas is 1.25 L. The vapor pressure of water at 22.5ºC is 20.4 torr. What will be the volume of the dry propane at STP? (5 points)
1. In the lab, students generated and collected oxygen gas according to the following reaction:
0. H2O2 (aq) 2 H2O (l) + O2 (g) (10 points)
1. How many mL of oxygen gas at STP were generated from 50.0 g of H2O2?
1. If 225 mL of oxygen gas at STP were needed for an experiment, how many moles of H2O2 would be needed?
Chapter 12:
Topics: Intermolecular forces : London forces, dipole dipole interaction, Hydrogen bonding, Their relative strengths and effects on boiling and melting points
