Amounts of Substance

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What is relative atomic mass?
The weighted average mass of an atom of an element, realtive to a twelth of the relative atomic mass of an atom of carbon 12
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What is the relative molecular mass?
The mass of that molecule compared to a twelth of the relative atomic mass of an atom of carbon 12
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What is avagardro's number?
6.022x10-23
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How do we work out number of moles?
mass in g/molar mass
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What is the ideal gas equation?
PV=nRT
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In the ideal gas equation, what are the units for pressure?
Pa
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In the ideal gas equation, what are the units for volume?
m3
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In the ideal gas equation, what are the units for temperature?
K
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How do you convert C to K?
Add 273
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How do you get from cm to m?
Divide by 1000
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How do you get from KPa to Pa?
Time by 1000
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How to work out the molecular formula?
Relative molecular mass/relative mass of emperical formula
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What units is concentration measured in?
mol dm-3
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How do you work out concentration?
moles/volume in dm3
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How do you calculate % atom economy?
Mass of desired/mass of reactants x 100
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How to calculate the yield of a reaction?
Number of molesof specified product/theoretical max number of moles of products x100
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What does atom economy tell us?
Tells us in theory how many atoms must be wasted in a reaction
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What does the percentage yield tell us?
Pratical effciency of a reaction
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Card 2

Front

What is the relative molecular mass?

Back

The mass of that molecule compared to a twelth of the relative atomic mass of an atom of carbon 12

Card 3

Front

What is avagardro's number?

Back

Preview of the front of card 3

Card 4

Front

How do we work out number of moles?

Back

Preview of the front of card 4

Card 5

Front

What is the ideal gas equation?

Back

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