Molecular Physics | Thermodynamics Answers

A 2.00-mol sample of helium gas initially at 300K and 0.400 atm is compressed isothermally to 1.20 atm. Noting that the helium behaves as an ideal gas, find
(a) the final volume of the gas
(b) the work done on the gas, hence, find the energy transffered by heat.

A thermodynamic system undergoes a process in which its internal resistance decreases by 500J. Over the same time interval, 220J of work is done on the system. Find the energy transferred from it by heat.

If a gas undergoes an Isobaric process, which of the following statments is true?
(a) the temperature of the gas doesn't change
(b) Work is done on or by the gas
(c) No energy is transferred by heat to or from the gas.
(d) The volume of the gas remains the same.

When a gas undergoes an adiabatic expansion, which of the following statements is true?
(a) The temperature of the gas does not change
(b) No work is done by the gas
(c) No energy is transferred to the gas by heat
(d) The internal energy of the gas does not change.

If a gas is compressed isothermally, which of the following statements is true?
(a) Energy is transferred into the gas by heat
(b) No work is done on the gas
(c) The temperature of the gas increases
(d) The internal energy of the gas remains constant

How much energy is required to raise the temperature of 5.00 kg of lead from 20.0 oC to its melting point of 327oC? (The specific heat of lead is 128J/kgoC.

An ideal gas is compressed to half its initial volume by means of several possible processes. Which of the following processes results in the most work done on the gas?
(a) Isothermal
(b) adiabatic
(c) Isobaric
(d) The work done is independent of the process.

Gas is contained in an 8.00-L vessel at a temperature of 20.08 oC and a pressure of 9.00 atm.
(a) Determine the number of moles of gas in the vessel.
(b) How many molecules are in the vessel?

A rigid tank contains 1.50 moles of an ideal gad. Determine the number of loes of gas that must be withdrawn from the tank to lower the pressure of the fas from 25.0 atm to 5.00 atm. Assume the volume of the tank and the temperature of the gas remain constant during this operation.

Is it possible for two objects to be in thermal equilibrium with each other if they are not in contact with each other? Explain.