Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 $\times$ 10^-7 mole of tritium, how many moles of tritium would be left after 78 years?

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The Answer of Tritium is a radioisotope of hydrogen having a half-life of 12.3 years.If you initially had 1.0 $\times$ 10^-7 mole of tritium, how many moles of tritium would be left after 78 years?

Tritium Is a Radioisotope of Hydrogen Having a Half-Life of 12.3