C2 - Formula Mass Calculations

  • Relative mass
  • moles
  • Mass
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What is relative atomic mass?
Total atomic mass in a compound.
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What are moles?
Equal to it's relative formula mass in grams.
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How do you calculate moles?
Number of moles = mass in grams (of element or compound) / relative formula mass
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How do you calculate percentage mass of an element in a calculate?
% mass = (relative atomic mass x no. atoms (of that element) / relative formula mass (of whole compound)) X100
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How do you calculate masses in reactions?
Write out the balenced equation, work out the relative formula mass for the two bits you want, divide to get one then multiply to get all.
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How do you work out percentage yield?
Percentage yield = (actual yield / predicted yield) x 100
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What is a reversable reaction?
Where the products of the reaction can themselves react to produce the original reactants.
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How can artificial colors be analysed?
They can be separated using chromatography paper.
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What is gas chromatography?
Can separate out a mixture of compounds and help you identify the substances present.
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Card 2

Front

What are moles?

Back

Equal to it's relative formula mass in grams.

Card 3

Front

How do you calculate moles?

Back

Preview of the front of card 3

Card 4

Front

How do you calculate percentage mass of an element in a calculate?

Back

Preview of the front of card 4

Card 5

Front

How do you calculate masses in reactions?

Back

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