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Please need help!!! Nuclear chemistry

Please need help!!! Nuclear chemistry-example-1

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Answer:

1.5 years

Step-by-step explanation:

The half life of substance A is 0.5 years, or 6 months. If the initial mass of substance A is 16, grams, then in 6 months it will become 8 grams. In another 6 months, it will become 4 grams. This means that in the space of a year, substance A has lost 12 grams. In another 6 months, it would halve to 2 grams which is the remaining number.

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