1. What is meant by the term empirical formula?

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2. 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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3. 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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4. State the mass and charge of a neutron

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5. 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.

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6. 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?

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

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8.

How many neutrons in a typical atom of sulfur?

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9. How many electrons can the first, second and third shells hold?

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