Download Q1: Under which the following circumstances does a real gas

Phys102
Term: 123
Online HW-Ch19-Lec01
Q1:
Under which the following circumstances does a real gas behave like an ideal
gas?
A. The interaction between the gas particles is negligible
B. The gas particle move very slowly.
C. There are only one kind of particles in the container
D. The interaction between the gas particles and the walls of the container is
negligible.
Ans:
E. None of the other answers.
A
Q2:
An ideal gas is initially at a pressure of 1.80 atm and has a volume of 3.00 L. It
expands isothermally to a final pressure of 0.300 atm. What is the work done in the
process? Answer in SI units and in 3 significant figures.
Ans:
vf
Pi
W = nRT ln � � = Pi Vi ln � �
vi
Pf
Pi
1.80
�
W = Pi Vi ln � � = 1.80 × 1.01 × 105 × 3.00 × 10−3 ln �
Pf
0.300
W = 9.77 × 102 J
Q3:
In a constant-volume gas thermometer, the pressure is 0.0140 atm at 100 degrees
Celsius. Find the pressure when the temperature is 400 degrees. Answer in atm. and
in 3 significant figures?
Ans:
Pi Pf
=
Ti Tf
Pf =
Pi
0.014
× Tf =
× (400 + 273) = 2.53 × 10−2 atm
(100 + 273)
Ti
KFUPM-Physics Department
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