1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: PV diagrams monatomic ideal gas

  1. Dec 12, 2011 #1
    1. The problem statement, all variables and given/known data
    Suppose a monatomic ideal gas is changed from state A to state D by one of the processes shown on the PV diagram. (Let V1 = 4.80 L and P1 = 3.30 atm.)

    (a) Find the total work done on the gas if it follows the constant pressure path A−E followed by the constant temperature path E−D.
    (b)Calculate the total change in internal energy of the gas during the entire process.
    (c)Calculate the total heat flow into the gas

    2. W=pi(vf-vi)
    (1.01e5)(3.3)(9.6-4.8)(.001)=1599.84 J
    (1.01e5)(6.6+3.3)(19.2-9.6)(.001)= 4799.5 J
    =6399 J

    Why is my work wrong??

    Attached Files:

  2. jcsd
  3. Dec 12, 2011 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    I am having trouble following your reasoning.

    First, why would W = Pi(Vf-Vi) if the pressure is constant at 2Pi for A-E?

    Second, why would you use 3Pi for the E-D path? Is the pressure constant during that process? What is the relationship between P and V during an isothermal process?

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook