1 mole of gas = 24 dm3 1 dm3 = 1000 cm3 1 m3 = 1000 cm3 A helium balloon has a volume of 48000 cm3. Calculate the moles of helium in the balloon. (2) All the formulae
mole = concentration × volume n = cv n = number of moles (mol) c = concentration of solution (mol/dm-3) v = volume of solution (dm-3) 1dm3 = 1000cm3
3.3.1 Percentage yield Percentage yield For a Stage 2 reaction the percentage yield was 92.3% The theoretical maximum mass of titanium produced in this batch was 13.5 kg. Calculate the actual mass of titanium produced. (2) Factors that affect % yield Not all reactant...
3.2.1 Moles (HT only) Moles Avogadro constant = 6.02 × 1023 No of molecules = mole × 6.02 × 1023 Mass of 1 mol of a substance = relative atomic mass (Ar) in grams if substance is an element = relative formula mass (Mr) in grams if substance is a compound Reacting...
3.1.1 Conservation of mass and balanced chemical equations Law of conservation of mass No atoms are lost or made during a chemical reaction So mass of products = mass of reactants Total mass before = 127.6 + 126.86 = 254.46 Total mass after = 153.09 + 101.37 = 243.46...