How much samarium-153 would remain 72 hours after a patient was treated with 2 grams of samarium-153?

An element with mass 490 grams decays 28.6% per minute. How much of the element is remaining after 16 minutes, to the nearest 10th of a gram?

If you leave a 100-W light bulb on for a week, how many joules of energy will be consumed?

The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced to a mass of 4 mg. What was the initial mass (in mg) of the sample? What is the mass (in mg) 6 weeks after the start? You may enter the exact value or round to 4 decimal places.

tritium, a radioactive isotope of hydrogen, has a hald-life of 12.4 years. of an initial sample of 41 grams, how much will remain after 94 years? Round the answer to four decimal places.