Calculations Flashcards
1
Q
Solids equation
A
mol = mass/Mr
2
Q
A piece of aluminium oxide has a mass of 5g. How many moles are there?
A
0.067 moles
3
Q
Liquids equation
A
moles = conc x volume (dm3)
4
Q
A sodium hydroxide solution has a concentration of 0.2 mol, what is the volume?
A
200.05cm3
5
Q
Gases equation
A
volume = moles x molar gas volume
6
Q
% yield equation
A
% yield = actual mass/theoretical mass x 100
7
Q
atom economy equation
A
Mr of useful product/Mr total mass of reactants x 100
8
Q
% by mass equation
A
sum of element Ar/total Mr of compound x 100
9
Q
Ideal gas equation
A
p x v = n x r x t
10
Q
Empirical formula equation
A
X% by mass/Ar Y% by mass/Ar then divide by lowest value
