# Chemistry

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What does atom economy mean?
It is a measure of the amount of starting materials that become useful products
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How can the atom economy of a reaction be calculated?
% atom economy = mass of desired product from equation ÷ total mass of products from equation X 100
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What is the concentration of a solution measured in?
Moles per cubic decimetre (mol/dm3)
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Volumes of gasses at the same temperature & pressure..
Contain the same number of molecules
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Ar =
Relative atomic mass
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Mr =
Relative molecular mass
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CaCo3 - CaO + CO2. If we have 50g of CaCO3, how much CaO can we make?
work out the Mr values for the 2 compounds CaCO3 = 40+12+16+16 + 16 = 100. CaO is 40 + 16 = 56. This means 100g of CaCO3 would yield 56g of CaO. In the Q we are told we only have half that amount of CaCO3 = 50g, so you would halve 56 to ans = 28g
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What is yield?
The yield is the actual mass of product made.
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The percentage yield can be calculated by..
Percentage yield = actual mass of product obtained ÷ maximum theoretical mass of product X 100
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## Other cards in this set

### Card 2

#### Front

How can the atom economy of a reaction be calculated?

#### Back

% atom economy = mass of desired product from equation ÷ total mass of products from equation X 100

### Card 3

#### Front

What is the concentration of a solution measured in?

### Card 4

#### Front

Volumes of gasses at the same temperature & pressure..

Ar =