Midterm 1 (Fall 2002)

Midterm 1 (Fall 2002) - CHEM 181 September 27, 2002 Gas...

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CHEM 181 MIDTERM #1 September 27, 2002 Gas Constants: 8.31451 J K –1 mol –1 , 8.20578 x 10 –2 L atm K –1 mol –1 , 1.98722 cal K –1 mol –1 Boltzmann constant: 1.3806 x 10 -23 J K –1 1 atm = 101325 Pa 1. (2 pt) State the 1 st Law of Thermodynamics 2. a.) (8 pts) Sketch a single diagram containing the isotherms of a real gas with T>T c , T=T c , and T<T c , and indicate on the diagram the location of the critical point. b.) (2 pt) What is the significance of the critical temperature? 3. Consider the conversion of one mole of a perfect monatomic gas from (P A , V A , T A ) to (P B , V B , T B ), where the final state is at a higher temperature and smaller volume, i.e. T B = β T A (with β >1) and V B = α V A ( α <1). The conversion from A to B is accomplished in a two step process. First the gas is heated (at constant volume) to T B . Then the gas is isothermally and reversibly compressed to V B .
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Midterm 1 (Fall 2002) - CHEM 181 September 27, 2002 Gas...

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