1. State the steps for calculating empirical formula

Question 1 of 9

2. State the mass and charge of an electron

Question 2 of 9

3. What is the atomic number of an oxygen atom?

Question 3 of 9

4. A sample of bromine contained the two isotopes in the following proportions: bromine-79 = 50.7% and bromine-81 = 49.3%. Calculate the relative atomic mass of bromine

Question 4 of 9

5. Write the electronic configuration of argon

Question 5 of 9

6. What is meant by the term empirical formula?

Question 6 of 9

7. 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.

Question 7 of 9

8. 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?

Question 8 of 9

9. Calculate the relative formula mass(Mr) of calcium hydroxide (Ca(OH)₂)

Question 9 of 9


 

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