Name:
Block:
Chapter 7 Study Guide
7.1 Chemical Names and Formulas:
Write the net formulas for the following and name the following compounds:
1.
2.
3.
4.
5.
Cu2+ and BrFe2+ and O2Pb2+ and ClCu2+ and NO3NH4+ and SO42-
For the above, NO3 is nitrate, NH4 is ammonium, and SO4 is sulfate.
6. Fill in the following table:
Group #
1
2
13
14
15
16
17
18
Cation or Anion?
7.3 Using Chemical Formulas:
Give the formula mass of the following compounds:
7. H2SO4
8. Al2S3
9. NaNO3
10. Ba(OH)2
Charge
How many moles of compound are there in the following? (mass given/formula mass= moles)
1. 6.6 g (NH4)2SO4
2. 25.0 g H2SO4
3. 125 g of sugar C12H22O11
4. What is the mass in grams of 6.25 mol of Copper (II) Nitrate? (Nitrate is NO3)
Find the percent composition of the following:
1. Find the percent of iron in Fe2(SO4)3
2. Find the percent composition of all atoms in NH4
3. Find the percent composition of water in ZnSO4◦7H2O
4. Magnesium hydroxide (Mg(OH)2) is 54.87% oxygen by mass. How many grams of oxygen are in
175 g of the compound? How many moles of oxygen is this?
Empirical and Molecular Formulas:
Show all work and box in your answers.
1. A 15.0 gram sample of a compound is found to contain 8.83 grams of sodium and 6.17 grams of
sulfur. Calculate the empirical formula of this compound.
2. Analysis of a 10.150 gram sample of a compound known to contain only phosphorus and oxygen
indicates a phosphorus content of 4.433 grams. What is the empirical formula of this compound?
3. A compound is found to contain 36.48%Na, 25.41% S, and 38.11% O. Find its empirical formula.
4. A compound is found to contain 63.52% iron and 36.48% sulfur. Find its empirical formula.
5. Qualitative analysis shows that a compound contains 32.38%sodium, 22.65% sulfur and 44.99 %
oxygen. Find the empirical formula of this compound.
6. Analysis of a 20.0 gram sample of a compound containing only calcium and bromine indicates that
4.00 grams of calcium are present. What is the empirical formula of the compound formed?
7. A 60.00 gram sample of tetraethyl lead, a gasoline additive, is found to contain 38.43grams of lead,
17.83 grams of carbon, and 3.74 grams of hydrogen. Find its empirical formula.
8. Determine the molecular formula for the compound with empirical formula P2O5 and molar mass of
284 g/mol.