Answer:
F = 1.128 10⁸ Pa
Step-by-step explanation:
Pressure is defined by 
 P = F / A 
If the gas is ideal for equal force eds on all the walls, so on the piston area we have 
 F = P A 
 We reduce the pressure to the SI system 
 P = 150 kpa (1000 Pa / 1kPa = 150 103 Pa 
we calculate 
 F = 150 10³ / 0.00133 
 F = 1.128 10⁸ Pa