| Compound | Number of Each Type of Element |
| CaC2O4 | |
| C6H5CHCH2 | |
| CuCO3(OH)2 | |
| Pt(NH3)2Cl2 | |
| K4Fe(CN)6 |
19. Predict the charges on the ions formed by aluminum and
selenium.
23. Give the symbols, including the correct charge, for each of the following ions:
| Ions | Charge |
| Strontium ion | |
| Aluminum ion | |
| Sulfide ion | |
| Cobalt(II) ion | |
| Titanium(IV) ion | |
| Hydrogen carbonate ion | |
| Perchlorate ion | |
| Ammonium ion |
25. For each of the following compounds, give the formula,
charge, and number of each
ion that makes up the compound:
| Compound | Formula, Charge, number of ions present |
| K2S | |
| NiSO4 | |
| (NH4)3PO4 | |
| Ca(ClO)2 | |
| KMnO4 |
31. Solid magnesium oxide melts at 2800 oC. This
property combined with the fact that it
is not an electrical conductor, makes it an ideal
heat insulator for electric wires in
cooking ovens and toasters (see the photo). In
contrast, solid NaCl melts at the relatively
low temperature of 801 oC. What is the
formula for magnesium oxide? Suggest a reason
for its melting point being so much higher than that
of NaCl.
33. Name each of the following ionic compounds:
| Ionic Compound | Name |
| K2S | |
| NiSO4 | |
| (NH4)3PO4 | |
| Ca(ClO)2 |
35. Give the formula for each of the following ionic compounds:
| Name | Formula |
| Ammonium carbonate | |
| Calcium iodide | |
| Aluminum phosphate | |
| Copper(II) Bromide | |
| Siver(I) acetate |
43. Calculate the molar mass for each of the following compounds.
| Compound | Molar Mass |
| Iron(II) oxide | |
| Boron trifluoried | |
| Manganese(II) chloride tetrahydrate |
47. Acrylonitrile, C2H3CN, is used to
make acrylic plastics. If you have 2.50 kg of
acrylonitrile, how many moles of the compound will
you have?
55. Vinyl chloride, CH2CHCl, is the basis of many
important plastics (PVC) and fibers.
(a) Calculate the molar mass
(b) Calculate the mass percent of each element in the
compound
(c) How many grams of carbon are there in a 454 g
sample of vinyl
chloride?
59. Acetylene is a colorless gas that is used as a fuel in
welding (just ask Bobby Z)
torches, among other things. It is 92.26% C and 7.74%
H. Its molar mass is
26.02 g/mol. Calculate the empirical and molecular
formulas for this compound.
97 Transition metals can combine with carbon monoxide (CO) to
form compounds such
as Fe(CO)5, and Co(CO)8.
Assume that you combine 0.125 g of nickel with CO and
isolate 0.364 g of Ni(CO)x. What is the
value of x?
112. When analyzed, an unknown substance gave these
experimental results: C, 54.0%,
H, 6.00%, and O, 40.0%. Four different
students used these values to calculate the
empirical formulas given below.
(a) C4H5O2
(c) C7H10O4
(b) C5H7O3
(d) C9H12O5
Which answer is correct? Why did some students not get the correct answer?