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Ideal gas law

AP.Chem: SAP‑7 (EU), SAP‑7.A (LO), SAP‑7.A.1 (EK), SAP‑7.A.2 (EK), SAP‑7.A.3 (EK)

Problem

A sample of HX2(g)\ce{H2}(g) is contained in a cylinder with a moveable piston at an initial pressure of P, start subscript, 1, end subscript. The volume of the sample is increased from 3, point, 0, space, L to 6, point, 0, space, L while the temperature is held constant, as shown in the diagram below.
What is the final pressure in the cylinder?
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