Answer:
0.7 atm
Step-by-step explanation:
For the Clapeyron's equation, we can calculate the change in the physical properties that happens when there is a state change:
P1*V1/T1 = P2*V2/T2
Where P is the pressure, V is the volume, T is the temperature, 1 is the initial state, and 2 the final state. So:
0.8*8.2/259 = P2*11.5/301
0.02533 = 0.038206*P2
P2 = 0.7 atm