Chapter1 Flashcards
Atom economy
% atom economy = molar mass of desired products/ molar mass of all reactants • 100
How many atoms are in a mole
Moles * Avogadro constant
Avogadro constant
6.02 *10^ 23
Relative atomic mass
Ar, is the weighed average mass of the naturally occurring Isotope
Molecular mass
Mr, average weighted mass of a molecule or the sum of ar
Calculating amount of substance (n)
n= m/M
Calculating mass (m)
m = nM
Calculating molar mass using moles
M= m/n
Moles from concentration and volume
n =C•V
Concentration calculation
C= n/v
Volume calculation
V = n/C
Molar ratios
The coefficients in a balanced chemical equation that well us the mole ratios of reactants and products
Mole fraction
Amount in mol of one component in e mixture divided by the total amount of all components in the mixture
Xî=ni/n total
% Composition by mass
Total mass of element/ total mass of compound •100
Molecular formula
Actual number of atoms in a compound C4H10
Empirical formula
Lowest whole number ratio of atoms in a compound C2H5
Water of crystalisation
Fixed number of water molecules present in one formula unit of salt
Limiting reagent
Limits amount of products made
Excess reactant
Remains after reaction finished
Calculations for limiting reagent
- Mol of each reactant
- Divide the mol by coefficient in balanced equation
- Lowest value is the limiting reagent
Theoretical yield
Maximum amount of product that can be formed in a chemical reaction
% Yield
Actual yield/ theoretical yield • 100
