Transcription of Tutorial 6 GASES - EIU
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Tutorial 6 GASES - EIU
T-41 Tutorial 6 GASESB efore working with GASES some definitions are needed:PRESSURE: atmospheres or mm Hg; 1 atm = 760 mm HgTEMPERATURE: Kelvin, K, which is oC + 273 STP: Standard Temperature and Pressure: 273 K and 1 atm (or 760 mm Hg)BOYLE'S LAW (temperature is constant): PV = constantThis is an inverse relationship: if one variable increases the other ' LAW (pressure is constant): V = constant x T This is a direct relationship: if one variable increases so does the 'S LAW (volume is constant): P = constant x TThis is a direct relationship: if one variable increases so does the GAS LAW: PV = nRT, whereP = pressure of the gas sampleV = volume of the gas sampleT = Kelvin temperature of the gas samplen = moles of the gas sampleR = molar gas constantAVOGADRO'S LAW: At the same temperature and pressure, equal volumes of allgases have the same number of molecules.
9) The pressure on a 500-mL sample of gas is changed from 1.25 atm to 5.00 atm. Calculate the volume. 10) A sample of oxygen occupies a volume of 437 mL at 25oC and 735 mm Hg pressure. Calculate the volume at STP. 11) A gas sample occupies a volume of 125 mL at 100oC and 500 mm Hg pressure. Calculate the volume at 250oC and 1750 mm Hg pressure.
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