Assume that you have a sample of gas in a cylinder with a moveable piston,as shown in diagram (1).The initial pressure,number of moles,and temperature of the gas are noted on the diagram.Which diagram (2)-(4)most closely represents the result of doubling the number of moles of gas while keeping the pressure and temperature constant?
A)diagram (2)
B)diagram (3)
C)diagram (4)

Question

Assume that you have a sample of gas in a cylinder with a moveable piston,as shown in diagram (1).The initial pressure,number of moles,and temperature of the gas are noted on the diagram.Which diagram (2)-(4)most closely represents the result of doubling the number of moles of gas while keeping the pressure and temperature constant? 
A)diagram (2) 
B)diagram (3) 
C)diagram (4)

Quizplus · Accepted Answer

According to the Ideal Gas Law, PV=nRT, keeping pressure and temperature constant, if the number of moles (n) is doubled, then the volume (V) must also double to maintain the equation. This is reflected in diagram (3) which shows the largest volume compared to the other diagrams. Diagram (2) shows a smaller volume than the initial volume, indicating that the number of moles decreased. Diagram (4) shows a larger pressure and smaller volume, indicating a decrease in temperature, which is not consistent with keeping temperature constant.

Assume That You Have a Sample of Gas in a Cylinder