12.2. Stoichiometric Calculations http://www.ck12.org
Lesson Review Questions
- Aluminum reacts with oxygen to produce aluminum oxide according to the following equation: 4Al + 3O 2 →
2Al 2 O 3
(a) How many grams of O 2 are needed to produce 5 moles of Al 2 O 3?
(b) How many grams of Al 2 O 3 are produced from the reaction of 5 moles of Al?
(c) How many grams of of Al are needed to produce 86.0 grams of Al 2 O 3? - How many grams of each reactant are needed to produce 0.500 mol of barium sulfate according the following
equation? BaCl 2 + Na 2 SO 4 →BaSO 4 + 2NaCl - How many grams of each reactant are needed to produce 28.6 grams copper (II) sulfide by the following
reaction? Cu + SO 2 →CuS + O 2
Further Reading / Supplemental Links
- Stoichiometry Calculator: http://mmsphyschem.com/stoichiometry.htm
- Practice Balancing Chemical Equations:
a. http://education.jlab.org/elementbalancing/index.html
b. http://www.files.chem.vt.edu/RVGS/ACT/notes/scripts/bal_eq1.html
c. http://gregthatcher.org/Chemistry/BalanceEquation/S - Chemical equation balances: http://www.personal.psu.edu/jzl157/balance.htm
Points to Consider
- Our study of masses and amounts, as described by a given chemical equation, has assumed that mass is
conserved for all chemical processes. How might you determine experimentally that this is the case for a
given chemical reaction? - So far, we have assumed that all of the reactants are utilized in the formation of products during each reaction.
Can you think of a case in which one or more reactants would not be completely consumed?