1. What is meant by the term molecular formula?

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

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

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4. How many electrons can the third shell hold?

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

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6. 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?

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7. What are the two parts of an atom?

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8. What is the atomic number of a chlorine atom?

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9. 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 9 of 9