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2. The half-life of radioactive 222Rn is 3.8 days. A sample of 222Rn is allowed to decay for 15.2 days and after this time, 5.6mmol

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2. The half-life of radioactive 222Rn is 3.8 days. A sample of 222Rn is allowed to decay for 15.2 days and after this time, 5.6mmol remained. What was the initial amount of 222Rn ? A) 90mmol B) 25mmol C) 45mmol D) 11mmol E) 35mmol

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