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

Question 2 of 9

3. Calculate the relative formula mass(Mr) of carbon dioxide (CO₂)

Question 3 of 9

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

Question 4 of 9

5. 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 5 of 9

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

Question 6 of 9

7. What is an atomic number?

Question 7 of 9

8. How many electrons in a chlorine atom?

Question 8 of 9

9. What is meant by the term molecular formula?

Question 9 of 9


 

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