Set 3 – Formulae

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Moles Set 3 - Formulae

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A compound with empirical formula CH2 has a relative molecular mass of 84. Which of the following is the molecular formula of the compound?

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Combustion of 7.8g of potassium produced 14.2g of an oxide. Which of the following is the simplest formula of the oxide of potassium formed?

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In a certain compound 15.5g of phosphorus combine with 20g of oxygen. What is the simplest formula of the compound?

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232g of an oxide of iron contains 168g of iron combined with 64g of oxygen. The empirical formula is.

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A sample of a compound containing copper and sulfur only was found to contain 127g of copper and 64g of sulfur. What is the empirical formula of the compound?

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The empirical formula of a compound:

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CuSO4

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CuS

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Cu2O

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Fe(OH)2

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ICl

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Ca3N2

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Ca(NO3)2

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(NH4)2S04

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NaHSO4

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BaCO3

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SO3

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P2O5

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ZnCl2

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Work out the names of each of the following compounds from their formula. Use the data sheet Names & Formulae of Some Common Ions

Formulae are Case Sensitive.

Remember to use regular numbers in formulae e.g. H2O not H2O

HBr

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nitrogen (v) oxide

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silicon (IV) fluoride

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phosphorus (III) chloride

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sulfur (VI) fluoride

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sulfur dichloride

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zinc oxide

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sodium sulfide

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calcium fluoride

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magnesium nitride

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silver nitrate

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barium hydroxide

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potassium carbonate

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calcium hydrogencarbonate

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ammonium chloride

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cobalt (II) nitrate

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iron (III) sulfate

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Work out the formula of each of the following molecular compounds.

Use a Periodic Table

hydrogen iodide

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carbon disulfide

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nitrogen trifluoride

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Work out the formula of each of the following ionic compounds. Use the data sheet ‘Names & Formulae of Some Common Ions’

Use upper case letter I for roman numerals e.g. (II)

Formulae are Case Sensitive.

Use regular numbers in formulae e.g. H2O not H2O

lithium bromide

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