Avogadro Constant: One mole = 6.02 x1023 particles, easier way to count number of particles. As mole linked to carbon- 12. 1 mole in grams = relative atomic mass. • Number of atoms = 6.02 x1023 x molar mass. 0.12 moles of S8 molecules means need to multiply by 8 as...
Molecular Formula: Covalent compounds and elements exist as molecules. • Empirical Formula: It is the simplest whole number ratio of atoms of each element in a compound. Used for giant structures of metals and ionic. • Relative Molecular Mass: Mr. Add relative atomic...
Water of Crystallisation: Water molecules that are bounded into crystalline structure of a compound. • Dot or .xH2O shows number of waters of crystallisation. Anhydrous means no waters of crystallisation. • Copper (II) Sulphate: When blue crystals of hydrated copper...
1 cm3 = 1 ml. 1dm3 = 1000 cm3 . • Concentration: Unit mol dm-3 . It is the amount of solute, in moles, dissolved in each 1 dm3 of solution. • Calculating Moles with Volumes: Moles (mol) = Concentration (mol dm-3 ) x Volume (dm3 ). If in cm3 / 1000 = dm3 . Standard...
Gas Volumes: At the same temperature and pressure, equal volumes of different gases contain same number of molecules. • Molar Gas Volume: Vm. It is the volume per mole of gas molecules. Volume of gas depends on pressure and temperature. • RTP: At RTP, 1 mole of gas...
Stoichiometry: The ratio of moles of each substance in a chemical reaction. • Balanced Equation: The balancing numbers gives molar ratio. • Find Moles- Various States: Can have solid go to gas or liquid. If asks to calculate volume of gas, remember there might be more...