2Calculate the volume of a given mass of a gaseous substance from its density at a given temperature and pressure.Include: molar volume calculationSolve problems requiring interconversions between moles, mass, volume, and number of particles.Additional KEY TermsSTP
3Avogardo ( )Avogadro’s Hypothesis - any sample of any gas at the same temperature and pressure will contain the same number of particles.
4Chemists use a standard temperature and pressure, STP, to measure gas volumes. 0°C and kPaAt STP:The volume of 1 mole of ANY GAS is 22.4 L.22.4 L/mol is known as molar volume.The MASS of 22.4 L of any gas is equal to themolar mass for that gas.
5How many moles are in 50.0 L of Fluorine gas at STP?F2 = 36.0 g/mol50.0 L22.4 L1 mol= mol
6What is the STP volume of 10.0 g of Methane gas? CH4 = 16.0 g/mol10.0 g16.0 g1 mol1 mol22.4 L= L
7Density: A physical property that describes the mass per unit volume of a substance. grams (g) per litregrams per mL (or cm3)
8Calculate the volume, in litres, of one mole of ammonia (NH3) at room temperature if the densityis g/L.NH3 = 17.0 g/mol1 mol1 mol17. 0 g0.696 g1 L= L
9Calculate the volume, in litres, of two moles of carbon dioxide, at room temperature, when the density is 1.80 g/L.CO2 = 44.0 g/mol2 mol1 mol44. 0 g1.80 g1 L= L
11· STP: 0°C and kPa (1 atm)· At STP, the molar volume of any gas is 22.4 L· Molar mass = total grams in 1 mole (g/mol)· 1 mole = 6.02 x 1023 particles (Avogadro)· density of a substance = mass per volume (g/L)* All roads lead to moles (convert to moles first).
12CAN YOU / HAVE YOU?Calculate the volume of a given mass of a gaseous substance from its density at a given temperature and pressure.Include: molar volume calculationSolve problems requiring interconversions between moles, mass, volume, and number of particles.Additional KEY TermsSTP