Chemistry II
Unit 10 Standards and Review Problems
Name_________________________________
Stoichiometry 2 Standards
S2.1.
a.
b.
c.
Review Concepts:
I can describe gas behavior (relationships between P, n, V, T)
I know the standard temperature and pressure (STP) for gases.
I can use an energy bar graph to show energy storage and transfer in a system.
S2.2. I can calculate the volume of 1 mole of gas at STP using experimental data.
S2.3. I can use the ideal gas law equation to determine the pressure, volume, number of moles, or
temperature in a sample of gas not at standard conditions.
S2.4. I can relate the molar concentration (molarity) of an aqueous solution to the number of moles
and volume of the solution.
S2.5.
a.
b.
c.
I can describe endothermic and exothermic reaction in terms of
energy bar graphs and system flow diagrams (LOLOL)
Balanced equations with a quantitative energy term
∆H notation
S2.6. I can write a balanced equation (with state subscripts) and…
a. use the volume, temp, and pressure of a gaseous reactant or product to predict the moles of
another reactant or product using a BCA table.
b. use volume and molarity of an aqueous reactant or product to predict the moles of another
reactant or product using a BCA table.
S2.7.
a.
b.
c.
I can use a BCA table to determine stoichiometric relationships in reactions involving…
volume of a gas
volume of a solution
energy of reaction
S2.8. I can use the following terms appropriately as they relate to this unit.
a. Partial Pressure
b. Molar Volume
c. Ideal Gas
d. Concentration
e. Molarity
f. Endo-, exothermic
g. Enthalpy
Molar volume and gas stoichiometry
1. A mixture contains 8.00 g each of O2, CO2, and SO2 at STP. Calculate the volume of this
mixture. Which of the gases would exert the greatest pressure and why?
22.4L
Molar volume =
1mole
2. Nitrogen gas and hydrogen gas combine to produce ammonia gas (NH3). What volume of
hydrogen gas at STP would be required to react with 10.0 g of nitrogen gas?
3. Consider the following reaction: P4(s) + 6 H2(g)  4 PH3(g)
What volume of hydrogen gas at 25C and 0.981 atm is required to react completely with 2.51 g
of P4 ?
L  atm
R  0.0821
PV  nRT
mole  K
Molar concentration
4. What mass of Na2CO3 is needed to prepare 1.25 L of a 0.75M solution?
Molar concentration and Stoichiometry
5. Lithium iodide(aq) reacts with silver nitrate(aq) to from solid silver iodide and aqueous lithium
nitrate. Determine the volume of a 1.50 M lithium iodide solution would be needed to exactly
react with 0.085 L of 0.50 M AgNO3.
Energy in Reactions
6. If you have every used a “Hot Hands” heat pack you have allowed oxygen gas to react with iron
solid to form iron (III) oxide. This reaction would release 1625 kJ of energy into its
surroundings (your hands).
a) Write the balanced equation for this reaction two ways, one with the energy as part of the
equation and the with the ∆H notation.
b) Create an energy bar graph for this reaction
c) If a typical “Hot Hands” contains 30.0 g of Fe, how many kJ of energy will be released?