Quantative chemistry Flashcards
Equation for mass
Moles x Mr
Equation for No. of moles
Mass divided by Mr
Concentration x Volume
What is conservation of mass?
Mass is never lost or gained in chemical reactions. We ay that mass is always conserved. The total mass of products at the end of the reaction is equal to the total mass of reactants in the beginning.
What is the definition of aqueous (aq) ?
It can be dissolved in water.
How do you work out the molar mass of a substance ?
Work out the relative formula mass of the substance in the first, then give this number as g/mol for it’s molar mass.
How do you work out the relative formula mass?
You add together the relative atomic mass (the bigger number) for all the atoms shown in its chemical formula.
Unit for molar mass
g/mol
Unit for volume
dm (cubed)
Volume of gas
mas of gas divided by Mr of gas x 100
% mass of an element =
Ar x No. of atoms of element divided by Mr od compound x 100
Mass=
Moles x Mr
Moles =
Conc x Volume
Mass divided by Mr
Atom economy
Mr desired product divided by Mr reactants x 100
Reactions can produce waste by products
Reaction doesn’t go to full completion
Mr =
Mass divided by moles
Conc =
Moles divided by Volume