Calculations quiz

1. State the particles that are found within the nucleus of an atom

2. Work out the empirical formula of an oxide of chlorine contains 7.1 g of chlorine and 1.6 g of oxygen.

3. To determine the formula of a metal oxide by combustion, magnesium is heated in a crucible. Why is the crucible is cooled, weighed, reheated, cooled, re-weighed, and so on?

4. Calculate the relative formula mass(Mr) of a molecule of bromine (Br₂)

5. What is the atomic number of a boron atom?

6. An oxide of nitrogen contains 26% nitrogen and 74% oxygen and has a relative molecular mass of 108. Find the empirical and molecular formulae for the oxide.

7. What is meant by the term empirical formula?

8. A sample of carbon contained 98.90% carbon-12 and 1.10% carbon-13. Calculate the relative atomic mass of carbon

9. Write the electronic configuration of potassium