A gas is sealed in a container with a removable piston, and the gas is free to e

Question

A gas is sealed in a container with a removable piston, and the gas is free to exchange heat with a bath of water surrounding the container. The gas is then compressed from 5.00 times 10^-4 m^3 to 3.00 times 10^-4 m^3 at a constant pressure of 400 kpa. While this happens, the water absorbs 150 J of heat from the gas. What is the change of thermal energy Delta E_ab of the gas during this process? -230 J -150 J -70 J 80 J 230 J A sample of an ideal gas is slowly compressed to one-half its original volume with no change in temperature. What happens to the average speed of the molecules in the sample? It becomes 1/4 as large as it was. It becomes 1/2 as large as it was. It remains the same. It becomes 2 times as large as it was. It becomes 4 times as large as it was. When a fixed amount of ideal gas goes through an isobaric expansion... no heat enters or leaves the gas. its pressure must decrease. its temperature must decrease. its pressure must increase. the gas does no work.

Explanation / Answer

Work done = P deltaV

= (400 x 10^3) (3 - 5) x 10^-4

= -80 J

so 80J is work done on gas and 150 J heat is extracted from gas

change in internal energy = 80 - 150 = -70 J

Ans(C)

9. average speed is dependent only on temp that is constant.

Ans(C)

10. in case of Isobaric expansion:

P = constant (Isobaric)

V = increases ( expansion)

V / T = constant

T = increases

Work done = P deltaV = positive

heat exchange will also happen.

Q = n Cp deltaT

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.