Heat and Thermodynamics:Entropy change in Isothermal process

One mole of an ideal gas is contained in a thermally insulated container that is connected to another container of equal volume that is initially evacuated. The valve connecting the two containers is now opened and the gas allowed to expand isothermally to fill both sides - new total volume is twice original volume.

B) Is this process reversible or irreversible? Why?

**Only the first container is insulated thus initial gas is not influenced by outside temp -- BUT gas will expand into the next container (vacuum)-- for this to occur isothermally -- heat has to be transferred into the system to keep temp constant-- (presumably through uninsulated valve and second container) pressure will decrease. Area under isotherm curve = W. Energy for same comes from outside system. Energy gas is same. What I need now is entropy change & is it reversible. delta S=(Q/T)r (if reversible) -- I'm thinking this process in NOT reversible.

Solution Summary

The gas expands isothermally from one container to the other.

Please help with the problems involving applied heat thermodynamics.
3. Calculate the change in enthalpy during a compression process in which the work done on the working medium is 24 kJ, and the change in internal energy is 36 kJ.
Heat added or rejected
4. Derive the numerical ratio ----------------------------

During the quasistatic isothermal expansion of a monoatomic ideal gas, how is the change in entropy related to the heat input Q by the simple formula: ΔS = Q/T?
Why isn't this valid for the free expansion process?

Calculate δH and δStotal when two iron blocks each with mass of 1.00kg, one at 25'C and one
at 250'C are placed in contact with each other in an isolated container. The specific heat capacity of iron is 0.449 J/'C*gram and can be assumed to be constant over this temperature range.

A heat engine operates between two reservoirs at T_2= 600K and T_1= 350K. It takes in 1000J of energy from the higher-temperature reservoir and performed 250 J of work. Find the entropy change of the universe and the work that could have been done by an ideal Carnot engine operating between these two reservoirs.
I've tried

1. For the following processes, state whether the driving force is the first or second law of thermodynamics. The systems are in italics and we are only interested in whether the properties of the system have changed. Explain your choice in 1-2 sentences.
a. Warming up exercises when muscles are worked the cells "burn" more g

Provide an explanation of the meaning of the first and second laws of thermodynamics. Then using the second law, explain why a barrel of oil can be used only once as a fuel source, why can we not recycle high-quality energy resources.

1. An ideal gas operates in a Carnot cycle so. that it produces a net positive work of 400joules per cycle. The maximum temperature during the cycle is 300 °C and the heat lost to a low temperature bath is 600 joules per cycle.
a) What must be the temperature of the low temperature bath?
b) What is the change in entropy of t

1. Solve both of the following problems
a. A sample of an ideal gas has the following initial conditions V=15L, T=250K and P=1atm. It is compressed isothermally until the change in entropy is -5J/K. What are the final conditions?
b. Calculate the change in entropy when 50g of 80C water is poured into 100g of 10C water. Assume