Hey there!:
The law of boyle is used:
initial pressure ( P1 ) = ?
initial volume ( V1 ) = 13 L
final pressure ( P2 ) = 1.8 atm
final volme ( V2 ) = 5 L
P1 *V1 = P2 * V2
P1 * 13 = 1.8 * 5
P1 * 13 = 9
P1 = 9 / 13
P1 = 0.692 atm
Hope this helps!
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