We can use something called Boyle's law. This states that the product of the volume and pressure is constant. This means that we can set the product of initial pressure and volume equal to the product of the final pressure and volume. The equation is:
P1*V1 = P2*V2
We know that:
V1 = 338L
P2 = Standard Pressure 1 atm
V2 = 294L
If we set up our equation, we can solve for P1 as:
P1 = P2*V2/V1
P1 = 1 atm * 294L / 338 L = 0.870 atm
Therefore:
The initial pressure (P1) is 0.870 atm
