Calculations

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  • Created by: Sunset
  • Created on: 05-01-14 15:19
What are isotopes?
Atoms that have the same atomic number but different mass number
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What is the relative formula mass of water (hydrogen = 1 and oxygen = 16)
18
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How do you find the percentage composition of one element in a compound?
(Total mass of element/total mass of compound) x 100%
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What is an empirical formula?
A molecular formula in its simplest ratio
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What would C2H6 be in an empirical formula?
CH3
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What does a reacting mass calculation tell you?
The mass of a product given the mass of the reactant or vice versa
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How is the number of moles calculated?
Mass (g) / Relative atomic Mass
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How is the mass of an element found?
Moles x Relative Formula Mass
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How is the percentage yield calculated?
(Actual Yield / Theoretical Yield) x 100%
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Why is the actual yield always lower than the theoretical yield?
Some of the product is lost in filtration, evaporation, heating, transferring liquids or side/reversible reactions
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You produce 12g of product when you expected 20g. What is your percentage yield?
60%
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Card 2

Front

What is the relative formula mass of water (hydrogen = 1 and oxygen = 16)

Back

18

Card 3

Front

How do you find the percentage composition of one element in a compound?

Back

Preview of the front of card 3

Card 4

Front

What is an empirical formula?

Back

Preview of the front of card 4

Card 5

Front

What would C2H6 be in an empirical formula?

Back

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