1. 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 1 of 9

2. What is the empirical formula of an alcohol with the analysis; 52.2% C, 13.0% H and 34.8% O?

Question 2 of 9

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

Question 3 of 9

4. Calculate the relative formula mass(Mr) of aluminium oxide (Al₂O₃)

Question 4 of 9

5. What is meant by the term molecular formula?

Question 5 of 9

6. Which particle(s) in an atom has a negative charge?

Question 6 of 9

7. To determine the formula of a metal oxide by combustion, magnesium is heated in a crucible. Why is a lid lifted from time to time?

Question 7 of 9

8. How many electrons in the outer shell of group 4 elements?

Question 8 of 9

9. How many neutrons in a typical atom of magnesium?

Question 9 of 9


 

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