
Answer:
0.87atm
Explanation:
Given parameters:
Pressure of the gas  = 1.1atm
Initial temperature  = 20.6°C  = 20.6 + 273  = 293.6K
Initial volume  = 19.2L
New volume  = 24.3L
Unknown:
New pressure  = ?
Solution:
To solve this problem, we apply the Boyle's law equation:
   P1V1  = P2V2
P and V are pressure and volume
1 and 2 are the initial and new states
    1.1 x 19.2  = P2 x 24.3
       P2  = 0.87atm