Post a New Question

physics

posted by .

1. When an ideal gas is expanded adiabatically in volume at constant pressure, the average kinetic energy of the gas molecule: A. Increase B. decreases C. Does no change
i know the answer is B but can someone explain why please? i thought it does not change since its adiabatically.

  • physics -

    The 1st law of thermodynamics
    ΔQ=ΔU+W= ΔU+pΔV
    For adiabatic process ΔQ=0 =>
    0=ΔU+pΔV
    if p=const and ΔV ↑ => ΔU ↓
    The internal energy ΔU depends on temperature; and temperature decreases as the kinetic energy of particles decreases

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Q: If the temperature is constant, what change in volume would cause the pressure of an enclosed gas to be reduced to one quarter of its original value?
  2. Physics Last Question HEEEELLLPPP !

    #1 The internal energy of the gas in a gasoline engine’s cylinder decreases by 295 J. If 47.0 J of work is done by the gas, how much energy is transferred as heat?
  3. Physics

    A container having a volume of 1 m3 holds 90 mol of helium gas at 176 ◦ C. Boltzmann’s constant is 1.38 × 10 −23 J/K. Assuming the helium behaves like an ideal gas, what is the average kinetic energy per molecule?
  4. physics

    One mole of an ideal gas occupies a volume of 3.5×10^-2m^3 and exerts a pressure of 3atm on the walls of its container.Find average translatoinal kinetic energy per molecule and the absolute temperature of the gas?
  5. science

    home / homework help / questions and answers / science / physics / the temperature of an ideal gas at an initial pressure ... Question The temperature of an ideal gas at an initial pressure P1 and volume V1 is increased at constant …
  6. chemistry

    1. Which example has particles that can be drawn closer to occupy smaller volume?
  7. chemistry

    1. Which example has particles that can be drawn closer to occupy smaller volume?
  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

    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 …
  10. physics

    A monoatomic ideal gas has Cp= 5R/2 a) four moles of the gas undergoes a process in which the temperature of the gas increases from 300 K to 500 K while the pressure is kept constant at 2.00 x 105 Pa. What is the change in the internal …

More Similar Questions

Post a New Question