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CH6_therm_prob

# CH6_therm_prob - Extra Problems for Chapter 6 9.3-4 12.1-2...

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Extra Problems for Chapter 6, 9.3-4, 12.1-2 1. A 1.0-liter sample of a gas is adiabatically expanded against a constant external pressure of 1.0 atm until the volume has increased to 10.0 liter. a) What is the work? [-910 J] b) Determine the change in internal energy of the system. [-910 J] c) Calculate the change in internal energy of the surroundings. [910 J] 2. Consider the molecule, ethanol CH 3 CH 2 OH( l ) a) Write the equation whose enthalpy change defines the enthalpy of combustion of ethanol, Δ H comb . b) Write the equation whose enthalpy change defines the standard enthalpy of formation of ethanol, Δ H o f c) Write the equation whose enthalpy change defines the enthalpy of vaporization of ethanol, Δ H vap . d) Write the equation whose enthalpy change defines the bond enthalpy of ethanol. 3. A styrofoam-cup calorimeter containing 150 g of water is calibrated by generating 1770 J of heat within it. The temperature increases by 1.67 o C. c s (H 2 O) = 4.184 J g 1 K 1 a) What is the calorimeter constant (heat capacity of the calorimeter)? [432 J K 1 ] b) What assumptions(s) are you making in order to do the calculation of part a)?

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-2- 4. One mole of argon gas is held in a rigid container whose volume is 22.41 L at 273.15 K.
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