PV = nRT
At constant temperature, nRT are constant
PV = Constant
V1 = 4.00L
V2 = 38.0L
The volume increased by a factor of (38.0/4.00)
The volume increased by a factor of 9.50
Since PV has to remain a constant, if volume increases by some factor, pressure has to decreases by the same factor so as to keep product of PV a constant.
Since volume increased by a factor of 9.50, pressure decreases by the factor of 9.50
P2 = P1 / 9.50
P2 = 133 atm / 9.50
P2 = 14.0 atm = PFinal
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