Quantitative Chemistry Flashcards
What is relative formula mass?
- The sum of all of the relative atomic masses of the elements in it
-In the ratio shown by the formula
How do you calculate the percentage of an element in a compound?
(Ar x number of atoms of that element / Mr of the compound) x 100
What is the law of conservation of mass?
Mass of reactants = mass of products
How many atoms are in a mole
6.02x10²³
How do you calculate the mass of one mole of element?
The Ar.
How do you calculate the number of moles?
Mass / Mr
How do you calculate the concentration?
Mass dissolved / volume of solution
or
Moles dissolved / volume of solution
What is the theoretical yeild?
The maximum mass of product expected form a reaction. Using reacting masses.
What is percentage yeild?
The actual yield compared to the theoretical yield
How do you calculate percentage yield?
(actual mass of product / maximum theoretical mass of product) x 100
How do you calculate atom economy?
(Mr of desired product / Mr of reactants) x 100
How do you convert from cm³ to dm³?
%1000
What volume does 1 mole of gas at room temperature and pressure take up?
24dm³
How do you calculate the volume of a gas?
Moles of gas x 24
How do you calculate the uncertainty
Half the range.
