1 Which is the formula of perbromic acid?

2. In which compound does bromine have an oxidation number of + 7?

3. What is the formula of nickel(II) bromite?

4. What is the formula of ammonium phosphate?

5. Which of the following is (are) correctly named?

1. Fe₂O₃, iron(II) oxide

2. MgCl₂, magnesium(II) chloride

3. Cr(NO₃)₃, chromium(III) nitrite

4. PCl, potassium chloride

6. What is the formula weight of amonium sulfate, (NH4)2SO4?

7. How many moles of calcium are in 15.5 g calcium chloride?

8. A 1.60 g sample of a substance contains 0.380 g carbon. What percent carbon does it contain?

9. A fluoride of uranium contains 24.2% fluorine and the rest uranium. What is the formula of this compound?

10. The empirical formula of a group of hydrocarbons is CH2. One of these, eicosene, has a molecular weight of 280 g. How many carbons are there in a molecule of eicosene?