Physics

posted by .

The temperature of a monatomic ideal gas remains constant during a process in which 4500 J of heat flows out of the gas. How much work (including the proper + or - sign) is done on the gas?
J

  • Physics -

    Well, to start - You must compress the gas to get heat out at constant temperature --> work in

    The process is isothermal (constant temp)

    In an ideal gas, the internal energy U depends only on T, so the change in U is zero so
    0 = Q - W
    but Q = -4500 J
    so
    0 = -4500 + W
    W = +4500 = work done BY gas
    so -4500 is work done ON the gas

  • Physics -

    I'm not sure what we are doing wrong but the computer is saying -4500 is wrong

  • Sign error -

    so
    0 = -4500 - W ======= NOT + W
    W = -4500 = work done BY gas
    so +4500 is work done ON the gas

    I prefaced this whole thing by telling you why W had to be positive then did not notice my sign error.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics HELP!!!!!!!!

    Suppose a monatomic ideal gas is contained within a vertical cylinder that is fitted with a movable piston. The piston is frictionless and has a negligible mass. The area of the piston is 3.06 10-2 m2, and the pressure outside the …
  2. physics

    We start with 5.00 moles of an ideal monatomic gas with an initial temperature of 123C. The gas expands and, in the process, absorbs an amount of heat equal to 1300J and does an amount of work equal to 2040J. What is the final temperature …
  3. help me please physics

    A monatomic ideal gas expands from point A to point B along the path shown in the drawing. (a) Determine the work done by the gas. J (b) The temperature of the gas at point A is 198 K. What is its temperature at point B?
  4. Physics 102 (College)

    A few homework problems. 1) The temp of a monotomic ideal gas remains constant (isothermic) during a process in which 4250 J of heat flows out of gas. How much work is done?
  5. PHYSICS

    Identify the following gas compression descriptions as adiabatic, isothermal or isobaric. a. As the gas compresses, the internal energy ÄU, decreases when the temperature decreases; the work done on the gas is greater than the heat …
  6. physics

    when 1240 J of heat are added to one mole of an ideal monatomic gas its temperature increases from 273K to 277K. Find the work done by the gas during the process.
  7. physics

    when 1240 J of heat are added to one mole of an ideal monatomic gas its temperature increases from 273K to 277K. Find the work done by the gas during the process.
  8. Physics

    A tank with a constant volume of 3.44 m3 contains 14 moles of a monatomic ideal gas. The gas is initially at a temperature of 300 K. An electric heater is used to transfer 52600 J of energy into the gas. It may help you to recall that …
  9. Physics

    A cylinder with a movable piston contains 14 moles of a monatomic ideal gas at a pressure of 2.26 × 105 Pa. The gas is initially at a temperature of 300 K. An electric heater adds 52600 J of energy into the gas while the piston moves …
  10. Physics

    Suppose that 4.7 moles of a monatomic ideal gas (atomic mass = 8.5 × 10^-27 kg) are heated from 300K to 500K at a constant volume of 0.47 m^3. It may help you to recall that CVCV = 12.47 J/K/mole and CPCP = 20.79 J/K/mole for a monatomic …

More Similar Questions