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The hydride of an unstable nuclide of a Group IIA metal, MH2(s), decays by alpha emission....

The hydride of an unstable nuclide of a Group IIA metal, MH2(s), decays by alpha emission. A 0.025-mol sample of the hydride is placed in an evacuated 1.7-L container at 298 K. After 91 minutes, the pressure in the container is 0.44 atm. Find the half-life of the nuclide.

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