P (kPa) 40.0 30.0 20.0 10.0 V (m³) 1.00 2.00 3.00 4.00 5.00 6.00 Figure P12.71

A gas has a constant pressure of 3000Pa. It is isobarically expanded from 0.75m^3 to 1.25m^3. During the process, 100J of thermal energy is added through heat.   a) What is the work done on the gas?          b) What is the change in internal energy of the gas?

A cylinder of volume 0.320 m3 contains 10.5 mol of neon gas at 17.4°C. Assume neon behaves as an ideal gas. (a) What is the pressure of the gas? Pa(b) Find the internal energy of the gas. J(c) Suppose the gas expands at constant pressure to a volume of 1.000 m3. How much work is done on the gas? J(d) What is the temperature of the gas at the new volume? K(e) Find the internal energy of the gas when its volume is 1.000 m3. J(f) Compute the change in the internal energy during the expansion. J(g) Compute ΔU − W. J(h) Must thermal energy be transferred to the gas during the constant pressure expansion or be taken away? This answer has not been graded yet. (i) Compute Q, the thermal energy transfer. J(j) What symbolic relationship between Q, ΔU, and W is suggested by the values obtained?

A gas in a cylinder is held at a constant pressure of 2.20×105 Pa and is cooled and compressed from 1.90 m3 to 1.10 m3 . The internal energy of the gas decreases by 1.15×105 J. a) Find the work done by the gas. Express your answer in joules b)Find the amount of the heat that flowed into or out of the gas. Express your answer in joules to two significant figures. c) State the direction (inward or outward) of the flow.

You have an ideal gas that expands from 0.50 to 4.0 L at a constant temperature of 300K. The gas does 250 J of work. How many moles of gas are there?

A sealed cylinder has a piston and contains 8.90×103 cm3 of an ideal gas at a pressure of 7.50 atm. Heat is slowly introduced, and the gas isothermally expands to 1.70×104 cm3. How much work ? does the gas do on the piston?

One mole of an ideal gas does 3900 J of work as it expands isothermally to a final pressure of 1.00 atm and volume of 0.022 m3. What was the initial volume of the gas, in cubic meters?  What is the temperature of the gas, in kelvin?

A sample of ideal gas in a thermally insulated container with a movable piston is initially in state A.  The gas is taken from state A to state B by an adiabatic process.  The dashed lines represent isotherms.  If W is the work done on the gas, Q is the energy transferred to the gas by heating, and  Delta U be the change in the internal energy of the gas during the process. a) is W greater than zero, zero, or less than zero? Explain briefly  b) is Q greater than zero, zero, or less than zero? Explain briefly. c) is  Delta U  greater than zero, zero, or less than zero? Explain briefly.

You would like to raise the temperature of an ideal gas from 295 K to 960 K in an adiabatic process. a)What compression ratio will do the job for a monatomic gas?  b)What compression ratio will do the job for a diatomic gas?

Calculate the temperature of the gas (in K) at Point A.  K (b) Calculate the temperature of the gas (in K) at Point B.  K (c) Calculate the temperature of the gas (in K) at Point C.  K (d) Calculate the work done during process AB.  J (e) Calculate the change in internal energy for the process AB.  J (f) Calculate the heat gained or lost during process AB.  J (g) Calculate the work done during process BC.  J (h) Calculate the heat gained or lost during process BC.  J (h) Calculate the work done during process CA.  J (i) Calculate the heat gained or lost during process CA.  J (j) Calculate the efficiency (as a percent) for this cycle.  %