Stoichiometry Fill-In Notes - Edl

1 Stoichiometry Fill-In NotesI. The Mole and the AtomA. Mole is also based on _____B. 1 mole = _____ = _____C. Sample calculations:D. Molar mass = _____ = _____II. Percent CompositionA. If given a formula, you can find a compound's percent composition. 1. Since atoms have _____, the _____ of these atoms in a compound relates to _____. 2. You can experimentally find the mass percent of each element present to _____B. Steps: 1. First, _____. 2. Second, _____. 3. Repeat for _____. 4. Check answer to make sure that Examples 1. sodium oxalate 2. acetic acid 3. calcium carbonate tetrahydrateStoichiometry Fill-In NotesIII. Empirical FormulaA. _____ to _____ (if it hasn't been done yet) 1. Assume that _____ = _____ 2.

2 For example: _____ = _____ B. _____ to _____ 1. _____ each element s mass by its corresponding _____ by _____ 1. Divide _____ by _____D. _____ til _____ 1. If you end up with _____, multiply all the values by _____ to end up with all _____. 2. This is the _____. E. Example: Ascorbic acid (vitamin C) contains C, H, and O by mass. What is the empirical formula of ascorbic acid? F. If the _____ of two separate materials is the _____, their _____ will be the Molecular FormulaA. If a problem includes a _____ (_____), you need to solve for Solve for the Find the molecular mass of Divide _____ by mass of Multiply answer _____ by the _____ in the empirical formula to get your Example: Using the data from the EF example, what is the molecular formula of the compound if its molecular weight is 176 g/mol?

3 Stoichiometry Fill-In NotesV. Balancing Chemical Equation HintsA. _____ Reactions 1. Balance _____ last. 2. If _____ends up being a half, multiply all _____ by two to create _____ 1. Treat them as _____ 2. For example: _____ --> 2 nitrates is easier than 2 nitrogens and 6 When in doubt, use redox (next chapter)D. A word about states (g and s) E. _____!VI. _____A. An AP Fave!!! 1. Use stoich to: 2. You get amount of O by Usually involves Example: Isopropyl alcohol, a substance sold as rubbing alcohol, is composed of C, H, and O. Combustion of g of isopropyl alcohol produces g of CO2 and g of H2O. Determine the empirical formula of isopropyl Fill-In NotesVII. _____A. Write out _____ if you are given _____ chemical _____ what you know.

4 D. Use _____to find out what it unknown. 1. Most of these problems will use the _____ 2. This ratio is given through the _____ and Theoretical Yield A. Write down what you know under the balanced chemical equation. B. Convert both values to _____. C. Choose the reactant that has a _____ 1. This is the _____. 2. The other reactant is the _____. D. Carry out the calculation as usual to find _____. E. Example: A strip of zinc metal having a mass of g is placed in an aqueous solution containing g of silver nitrate, causing the following reaction to occur:!(a) Which reactant is limiting? (b) How many grams of Ag will form? (c) How many grams of Zn(NO3)2 will form? (d) How many grams of the excess reactant will be left at the end of the reaction?

5 Stoichiometry Fill-In NotesIX. The problem will state the Calculate your Use this equation:D. Should always be If > 100%, there are _____A word about the PT