Maths Equations AS Flashcards
1
Q
Relative isotope Ar
A
[(mass of A x isotope A %) + (mass of B x isotope B %)] ÷ sum of all %
2
Q
Moles
A
Mass ÷ Mr
3
Q
Moles
A
Concentration x volume (in dm)
4
Q
Moles
A
Number of particles ÷ Avogadro’s constant
5
Q
Volume of gas (dm)
A
Moles x 24
6
Q
Concentration in gdm
A
Concentration in mol dm x Mr
7
Q
Pressure
A
nRT ÷ V (PV = nRT)
P = Pa, V = m, T = K
8
Q
Molecular Formula
A
Empirical Formula x ‘multiplier’
9
Q
Percentage yield
A
(Actual yield / Theoretical yield) x 100
10
Q
Atom Economy
A
(Mr of desired product / Mr of all reactants) x 100
11
Q
Density
A
Mass / Volume
12
Q
Bond Enthalpy
A
∆H = bonds broken - bonds formed
(reactants - products)
13
Q
Enthalpy of Formation
A
Reactants - Products
14
Q
Enthalpy of Combustion
A
Products - Reactants
15
Q
Q
A
Q = MC∆T
