Finding heat capacity of gas

Question

Assignment:

Q1. 5.30 moles of gas, initially at 25 degrees celcius and 5.00 atm pressure, was allowed to expand adiabatically( with no heat exchange between systen and surroundings) against a constant external pressure of 1.50 atm until the initial volume had trebled. The heat capacity of the gas was known to be 37.1 J/ degree celuius mol
Determine the following.

1. Inital volume

2. The finial volume

3. w

4. q

5. change in Energy

6. The final temperature of the gas

Q2. Would it be feasible to make ethanol, C2H5OH, by the following reaction ( under standard conditions and 25 degrees C)

C₂H₄(g) + H₂O(l) --------- C₂H₅OH(l)

Q3. Calculate the molar entropy of vaporization of water

change in Hf values (kJ/mol) : C₂H₄(g) = 52 H₂O(l)= -286
H₂O(g) = -242 C₂H₅OH(l) = -278

S Values(J/K mol): C₂H₄(g) = 220 H₂O(l)= 70
C₂H₅OH(l) = 161

Boiling point H₂O is 100 degrees celcius.