CHEM101 Lecture Notes - Lecture 24: Molecular Mass, Stoichiometry, Ideal Gas Law

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14 Mar 2016
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CHEM101 Full Course Notes
CHEM101 Full Course Notes
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Unique behaviour of gases compared to solids and liquids: gas volume changes signiicantly with pressure. Force is required to compress gas: gas volume changes signiicantly with temperature. 500-100 imes greater that solids or liquids over the same temp range: gases low freely low/no fricion, gases have low density, gases form soluions at any proporion. Amount of substance: n, number of moles (can relate to mass if we know the molar mass. Volume: v, litres, 1l = 103 cm = 103 ml. Temperature: measure in celsius or kelvin, always use k in calculaions, tk. Pressure: si unit is pascals, typically a very large number. 1atm = 101. 3 kpa = 760 torr: this leads to the ideal gas law. R is the gas constant, obtained experimentally, 8. 314 j/mol k. Is accurate for gases at low pressure and very low temperature (~ 50 degrees above the boiling point)