The radioisotope, tritium (1H3) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?

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The radioisotope, tritium (1H3) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, then 2 mg of it would remain after 49.2 years.