CHEM 1211 Lecture 24 Outline of Last Lecture I Behaviors of Gases II General Properties of Gas III Pressure IV Boyle s Law V Charles s Law VI General Gas Law Outline of Current Lecture I Avogadro s hypothesis II Ideal Gas Law A Rules B Types of problems you may encounter III IV Standard temperature and pressure Gas Density Current Lecture I Avogadro s hypothesis 2H2 g O2 g 2H2O g 8 molecules 4 molecules 8 molecules II Ideal Gas Law P x V constant nxT PxV nxRx T R gas constant 0 08206 L x atmosphere mol x K A Rules 1 Convert temperature to K 2 Convert grams to moles 3 Convert to units of R L atm mol K B Types of problems you may encounter 1 Determine one unknown quantity of one gas variable P V T n given the other values directly or indirectly 2 Stoichiometry problems 3 Determine the new values of P V T or n after a gas undergoes a change 4 Gas density and molar mass problems III Standard temperature and pressure 1 atm 760 torr or mm Hg and 0 C 273 15 K PV nRT v nRT P standard molar volume of any gas V 1 mol 0 08206 L x atmosphere mol x K 273 15K 1 00 atm IV Gas Density D is directly proportional to P and Mwt D is indirectly proportional to T N moles mass g x 1 Mwt g mol M P x Mwt Density V RT g L
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