Amount Of Substance Flashcards
(11 cards)
How do you work out water of crystallisation
-write down molecules involved
-write the masses of the molecules
-work out the moles
-divide all numbers by the smallest moles
-that’s the ratio of the molecule to water
How do you work out the amount of particles?
Moles X avagardos constant
What’s the ideal gas equation and the units
PV=NRT
P- pa
T - Kelvin
Define emperical formula
Simplest whole number ratio of elements in a compound
How do you work out emperical formula
-write the elements
-white percentages as masses
-divide by mr to get moles
-divide by smallest number of moles
- you then get the simplest whole number ratio of elements in the compound
How do you workout percentage yield
( Actual yield / theoretical yield ) X 100
Define atom economy
How efficient a reaction is
What factors affect yield
-reaction may not complete
-reactants may be impure
-other reactions may take place leading to by products
-products may be left in the reaction vessel
-separation and purification may result in loss of product
What is an addition reaction
It’s has only one product
100 percent atom economy
What’s a substitution reaction?
They have more than one product
Have an atom economy less than 100
Define molecular formula
The actual number of atoms of each element in a molecule
