Quantitative Chemistry Flashcards
What is the law of conservation?
No matter is lost or gained during a chemical reaction.
What is relative formula mass?
The relative atomic mass (mr) of a compound is the sum of the relative atomic masses of the atoms shown in formula.
What is the equation for relative atomic mass?
Mass number x isotope abundance divided by 100
What is a mole?
1 mole of any substance weighs it’s atomic mass in grams
What is the value of the Avogadro Constant?
6.02 x 10^23 per mole
How do you work out the mass of an element?
Mass = Moles x mr
What is the definition of a limiting reactant?
A reaction finishes when one of the reactants is all used up.
What is the concentration equation?
Concentration (g/dm3) =
Volume of solution
What is the mass concentration equation?
mass concentration = mass
———–
volume
What is percentage yield?
A measure of how effectively the reactants have been converted into products.
What is the percentage yield equation?
Percentage yield =
Actual Yield
———————- x 100
Theoretical Yield
What is the mole of any gas?
24 dm^3 or 24,000 cm
What is the atom economy equation?
Atom economy =
Mr useful product
————————— x 100 %
Mr of all products
What do you do to get from cm3 to dm3?
Divide by 1000
