The Same Activity Is Measured for Two Different Isotope Samples

question 19

Multiple Choice

The same activity is measured for two different isotope samples. One sample contains 0.0450 kg of (atomic mass = 230.033 937 u, t_1/2 = 20.8 days) . The second sample contains an unknown amount of (atomic mass = 231.036 264 u, t_1/2 = 4.3 days) . What is the mass of the second sample?

• A)0.0093 kg
• B)0.23 kg
• C)0.110 kg
• D)0.037 kg
• E)0.0450 kg

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