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A 2 0 0 g sample of a radioactive material, mendelevium - 2 6 5 , is placed in a sealed chamber. Three hours later,

A $200$ g sample of a radioactive material, mendelevium $- 265,$ is placed in a sealed chamber.

Three hours later, $140$ g of mendelevium $- 265$ remains.

To the nearest tenth of an hour, what is the half $-$ life of this material?

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