A cylinder with a movable piston contains 4.00 liters of a gas at 30o C and 5.00 bar. The piston is slowly moved to compress the gas to 8.00 bar. Assume ideal gas behavior. a. Considering the system to be the gas in the cylinder and neglecting ∆Ep, write and simplify the closed-system energy balance. Do not assume that the process is isothermal in this part. b. Suppose now that the process is carried out isothermally, and the compression work done on the gas equals 7.65 L∙bar. If the gas is ideal so that ? is a function only of T, how much heat (in joules) is transferred to or from (state which) the surroundings? (Use the gas-constant table in the back of the book to determine the factor needed to convert L∙bar to joules.) c. Suppose instead that the process is adiabatic and that ? ̂ increases as T increases. Is the final system temperature greater than, equal to, or less than 30 oC? (Briefly state your reasoning.)
2. A cylinder with a movable piston contains 4.00 liters of a gas at 30o C and 5.00 bar. The
piston is slowly moved to compress the gas to 8.00 bar. Assume ideal gas behavior.
a. Considering the system to be the gas in the cylinder and neglecting ∆Ep, write
and simplify the closed-system energy balance. Do not assume that the process is
isothermal in this part.
b. Suppose now that the process is carried out isothermally, and the compression
work done on the gas equals 7.65 L∙bar. If the gas is ideal so that ? is a function
only of T, how much heat (in joules) is transferred to or from (state which) the
surroundings? (Use the gas-constant table in the back of the book to determine the
factor needed to convert L∙bar to joules.)
c. Suppose instead that the process is adiabatic and that ? ̂ increases as T increases.
Is the final system temperature greater than, equal to, or less than 30 oC? (Briefly
state your reasoning.)
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