CHEM102 Lecture 8: CHEM 102 - Lecture #8 - Introduction to Chemical Equilibrium
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Challenge: pV work 1 Consider a container with a frictionless piston that contains a given amount of an ideal gas. Letâs assume that initially the external pressure is 2.20 bar, which is the sum of a 1 bar atmospheric pressure and the pressure created by a very large number of very small pebbles that rest on top of the piston. The initial volume of gas is 0.500 L and the initial temperature is 25°C. Now, you will increase the volume of the gas by changing the external pressure slowly in a way that guarantees that the temperature of the system remains constant throughout the process. To do this, imagine you remove the pebbles one by one slowly to increase the volume by an infinitesimal amount. Every time you remove a weight you allow the system to equilibrate. Your cylinder is immersed in a water bath at 25°C, which keeps your gas at the same temperature throughout the whole process. Remember to use three significant figures for all numerical answers. The margin of error for each numerical answer is 1%. To avoid rounding errors use the unrounded intermediate values in your final calculations. Note: You may find an equation to solve this problem in a textbook or online, but the goal of this challenge is that you think through the problem and come up with the equation on your own. This problem requires basic calculus, so be ready to integrate! | Part A What is the volume of the gas when you remove all pebbles?
SubmitMy AnswersGive Up Part B What is the final pressure of the gas?
SubmitMy AnswersGive Up Part C Now consider the work performed by the sytem. What is the sign of w? Now consider the work performed by the sytem. What is the sign of w?
SubmitMy AnswersGive Up Part D What is the value of w?
SubmitMy AnswersGive Up |