10.11.11 discussion solns

10.11.11 discussion solns - Chemistry 152 Discussion...

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Chemistry 152 Discussion Section Problems: Oct. 11, 2011 1) Suppose 1.00 kJ of heat is transferred to 2.00 mol of argon, which initially is at T=298K and P=1atm. What will the final temperature be if the heat is transferred at: a) constant volume; b) constant pressure. Calculate Δ E and Δ H for each case. Assume argon can be treated as an ideal monatomic gas. Solution: Ideal monatomic gas, so C v =3R/2=12.47 JK -1 mol -1 and C p =5R/2=20.79 JK -1 mol -1 . a) At constant volume b) At constant pressure 2) Human beings do work during expansion and contraction of their lungs in breathing. During each exhalation from the lungs an adult human pushes out about 0.5L of gas against a constant atmospheric pressure of 1.00 atm. An adult exhales about 15,000 times during a 24 hour period. a) Calculate the amount of work done by an adult in breathing during a 24 hour period. b) Suppose all the work done by an adult in breathing in a 24 hour period is used to lift a 900 kg (about 1 ton) weight. How high would this weight be lifted? Note the acceleration due to gravity is g=9.8ms

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