Initial amount of Argon 44 is 9.2 gram.
Half life of Argon 44 is 12 minutes.
Then in 12 minutes, mass of Argon 44 changes from 9.2 gram to 4.6 gram.
In another 12 minutes, mass of Argon 44 further changes from 4.6 gram to 2.3 gram.
Therefore, mass of Argon 44 left after 24 minutes is 2.3 grams.
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