The half-life of tritium is 12 years so if you started with 2.00 g of tritium how many mg would remain after 120 years?

Let's see. 1g = 1,000 mg 2g = 2,000 mg half life of tritium is 12 years How much will we have after 120 years? We now have 2,000 mg After 12 years 1,000 mg After 24 years 500 mg After 36 years 250 mg After 48 years 125 mg After 60 years 62.5 mg After 72 years 31.25 mg After 84 years 15.625 mg After 96 years 7.8125 mg After 108 years 3.90625 mg After 120 years 1.953125 mg Of course the above includes too many significant figures If we start out wit 2 g, we are probably measuring to 2 place accuracy The final result would probably look something like this We now have 2,000 mg After 12 years 1,000 mg After 24 years 500 mg After 36 years 250 mg After 48 years 130 mg.

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