PLC Activity #12
Ideal Gas Law
Due: see website for due date
How to get credit for this activity
First, sign-in at the computer and sign-out when the activity is complete. Show your work
and results to a PLC tutor so they can check your work and initial the signoff sheet. Be
prepared to answer questions about the activity or your results.
Problem 1: Consider an ideal gas contained in a confined volume. Setup the Ideal Gas
Law equation to answer this question: how would the pressure of the gas change if
a. How would the pressure of the gas change if the number of molecules of the gas
were doubled as well as doubling the volume, without changing the temperature of
the gas?
b. The temperature of the gas is held fix. If the pressure is reduced to one-fourth its
initial value and the volume is expanded to twice its value, how would the number of
molecules of the gas change?
c. The temperature (in K) of the gas were doubled, while the pressure decreases to
one-eighth its initial value and the number of molecules is held fix. How would the
volume change from its initial value?
Problem 2: The cylinder in the drawing contains 3.00 mol of an
ideal gas. By moving the piston, the volume of the gas is
reduced to one-fourth its initial value, while the temperature is
held constant. How many moles ∆n of the gas must be allowed
to escape through the valve, so that the pressure of the gas
does not change?