chemical calculations Flashcards
RAM from percentage abundance of isotopes
(mass number of isotope x %abundance) + (mass number of isotope x percentage abundance) /100
Avogadro’s number
6.02x10^23
moles from masses
- moles = mass x mr
- animals on the bottom (moles & RAM)
- mass = Mr Moles
what is relative atomic mass
the average mass of atoms of an element relative to the mass of an atom of carbon-12
why can you have relative atomic masses that aren’t whole numbers
it is the mean average relative atomic mass of the isotopes
gas volume calculations
moles of substance x 24 (answer in dm^3)
atom economy
(RFM of product/ RFM os all reactants ) x 100
percentage yield
(actual yield/theoretical yield) x 100
metal + water →
metal hydroxide + hydrogen 2
substance + oxygen →
oxides
metal + acid →
salt + hydrogen
oxide + acid →
salt + water
hydroxide + acid →
salt + water
carbonate + acid →
salt + water + carbon dioxide
hydrogencarbonate + acid →
salt + water + carbon dioxide
