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When answering this could you please write out your steps so i can better understand it,...

When answering this could you please write out your steps so i can better understand it, Thank you!!!

I apologize for the long question, it is all related and i don't know if posting them separately would confuse people.

Suppose system A having a (constant) temperature of 53°C loses 19 mega-joules
through heat loss to system B having a (constant) temperature of 15°C. What is the
entropy loss of system A?
a. -1.34 x 105 J/K
b. -8.16 x 104 J/K
c. -5.83 x 104 J/K
d. -1.11 x 105 J/K
The entropy change of system B is:
a. 1.45 x 105 J/K
b. 6.6 x 104 J/K
c. 1.98 x 105 J/K
d. 2.64 x 104 J/K
The entropy change of the entire Universe caused by this process is therefore:
a. 1.77 x 104 J/K
b. 7.69 x 103 J/K
c. 3.85 x 103 J/K
d. 2.15 x 104 J/K
What is the entropy increase of 5 moles of an ideal gas (just the gas) if it is
isothermally expanded to twice its initial volume?
a. 0 J/K
b. 28.8 J/K
c. 8.64 J/K
d. 43.2 J/K
What is the entropy of the Universe overall associated with the isothermal
expansion in the previous question?
a. 28.8 J/K
b. 43.2 J/K
c. 0 J/K
d. 8.64 J/K
What is the entropy increase of the same sample of gas (just the gas) if it is
instead freely expanded to twice its initial volume?
a. 43.2 J/K
b. 28.8 J/K
c. 8.64 J/K
d. 0 J/K
What is the entropy of the Universe overall associated with the free adiabatic
expansion in the previous question?
a. 0 J/K
b. 28.8 J/K
c. 43.2 J/K
d. 8.64 J/K

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