Amount of a substance (Formulas and definitions)
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1
Define 'The Mole'
The same amount of particles there are in 12.000g of a Carbon-12 Isotope
2
Define 'Avogardo's number'
6.0225x10^23 molecules in a mole
3
Define 'RAM' (relative atomic mass)
The weighted average mass of an atom of an element realitive to 1/12 the mass of an Carbon-12 Isotope
4
Define 'RMM' (realtive molecular mass)
The combined weighted average mass of all the constituent atoms of each element of a compound realtive to 1/12 of the mass of a Carbon-12 isotope
5
What is the Old equation to find out Volume from Moles and the conditions you need for it to be used
Moles = Volume / 24 [only working at 20deg C and 1ATM]
6
What is the formula relating Concentration, Mr and mass concentration
Conc = g/dm^3 / Mr
7
What is the equation linking Moles, Volume and Concentration and the units needed
Moles = Conc x Vol
Conc in mol/dm^3
Vol in dm^3
Conc in mol/dm^3
Vol in dm^3
8
What is another word for Concentration?
Molarity
9
What is the formula for Atom economy and the additional A-level knowlege needed
Atom economy = Useful product total mass / Total mass of all products x 100
[You will have to figure out the useful product yourself]
[You will have to figure out the useful product yourself]
10
What is the definition of emperical formula?
The simplest whole number ratio of atoms of each element in a compound.
11
What is the formula to use for titration?
Volume1 x Conc1 = Volume2 + Conc2
12
What is titration used for?
To find the amount of acid/ alkali present in a solution
13
How do you work out emperical formula
-Find the moles of each side
-Find a whole number ratio for both sides using the moles
-Find a whole number ratio for both sides using the moles
14
When working with emperical formula, what should you do if you see a number end in 0.5?
multiply everything by 2
15
When should you multiply everything by 3 when working with emperical formula?
When a number ends in 0.33 or 0.67
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