calculations

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  • Created by: 14megan
  • Created on: 09-06-19 12:45
what is the relative formula mass (Mr) of a compound?
the mass of all the elements in the compound added together.
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how do you work out the percentage mass?
total mass of the element/Mr of entire formula x 100
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how do you work out the percentage yield?
actual yield/theoretical yield x 100
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what is the empirical formula?
the simplest whole number ratio of atoms in a formula.
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what is the method of working out the empirical formula?
1.write down the elements. 2.write the masses/percentages given under each element. 3.divide these numbers by the atomic masses of the elements. 4.divide these anwers by the smallest answer you get. 5.write out the formula and simplify.
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how do you work out the mass?
moles x molar mass
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how do you work out the moles?
mass/molar mass
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how do you work out the molar mass?
mass/moles
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Card 2

Front

how do you work out the percentage mass?

Back

total mass of the element/Mr of entire formula x 100

Card 3

Front

how do you work out the percentage yield?

Back

Preview of the front of card 3

Card 4

Front

what is the empirical formula?

Back

Preview of the front of card 4

Card 5

Front

what is the method of working out the empirical formula?

Back

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