apply Boyle's law
Boyle's Law, an ideal gas law which states that the volume of an ideal gas is inversely proportional to its absolute pressure at a constant temperature
V = 1/P
PV = 1
PV= constant
let 15L = V1 and 125kPa = P1
9L =V2 and P2 = ?
Now from Boyle's law
P1V1 = P2V2
Substitute the values
15L * 125kPa = 29 * P2
P2 = 64.65kPa
convert Pascal's into atm
1 pascal =
9.869 × 10-6 atmosphere
P2 = 64.65 *10^3 *9.869 × 10-6 (kPa is kilo Pascal's)
