A Pure Sample of Tritium, ³H, Was Prepared and Sealed

question 104

Multiple Choice

A pure sample of tritium, ³H, was prepared and sealed in a container for a number of years. Tritium undergoes β decay with a half-life of 12.32 years. How long has the container been sealed if analysis of the contents shows there are 5.25 mol of ³H and 6.35 mol of ³He present?

• A) 2.34 yr
• B) 3.38 yr
• C) 9.77 yr
• D) 14.1 yr
• E) 25.6 yr

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