Physical Chemistry problem,please help!

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Can someone help me with this problem?

Things that are given: ΔHf:enthalpy change ΔGf:Gibbs energy change

for p=1atm and T=25 C

ΔHf(kcal/mol) ΔGf(kcal/mol)
H2O(g) -57.79 -54.63
H2O(l) -68.32 -56.69

Find
1)Vapour pressure of H20 at T=25 C
2)Vapour pressure of H2O at T=50 C
3)The maximum work (kJ/mol) that we can take with electrochemical burn of H2 on a fuel cell at T=25 C:
H2(g)+1/2O2(g)=H20(l)
4)The heat,Q,that goes out on the surrender(kJ/mol) for the 3rd problem
5)How much kg H2 are required for a car with 100HP to travel a distance of 500km in 4h?
6)What is the ΔS of H2(g)+1/2O2(g)=H2O(g)?

Sorry for the bad english!I would highly appreciate it if someone could help me...
 

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