Radium-223 has a half-life of 11.0 days. How much of a 60.0 mg sample of Ra-223 is still active after 44.0 days?
Radium-223 has a half-life of 11.0 days. How much of a 60.0 mg sample of Ra-223...
Question 1: Radium-223 is a radioactive isotope with a half-life of 11.4 days. How long (in days) will it be before 75% of the sample has decayed? _____days Question 2: 198Au (t1/2 = 2.69 days) is used in the diagnosis of liver problems. What is the rate constant (units in terms of days) of 198Au? What percent of the original 198Au remains after 16.1 days?
The half-life of an element is 45 minutes. How much of a 7.0 mg sample is still active after 3 hours 0.88 mg 0.50 mg 1.0 mg 3.5 mg
Gold-198 has a half-life of 2.7 days. How much of a 941.5 mg gold-198 sample will remain after 13.5 days?
Radium-223 decays with a half-life of 11.4 days. You may want to reference (Pages 619-622) Section 17.5 while completing this problem. Part A How long will it take for a 0.240-mol sample of radium to decay to 3.00 x 10-2 mol? 19] ΑΣΦ ? 79.756 days Submit Previous Answers Request Answer X Incorrect; Try Again: 5 attempts remaining < Return to Assignment Provide Feedback
Fluorine-20 has a half-life of 11.0 s. If a sample initially contains 36.0 μg of this isotope, how much remains after 44.0 s ? Express your answer in micrograms to three significant figures.
How long will it take for a sample containing 1.00 g of 223 88 Ra to reach a point where it contains only a 0.25 g of 223 88 Ra? The half-life of 223 88 Ra is 12 days
Consider a 15.60g sample of 131I, which has a half-life of 8.02 days. a. How much of the sample (in grams) will remain after 16.04 days? b. How much of the sample will remain after 16.04 hours?
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 5.80 mg sample would be left after 40.0 days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol.
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 X ?
Radium-226. a radium isotope, has a half-life (the time it takes half of the isotope to decay) of about 1620 years. A sample of radium-226 has a mass of 30 grams. Which of the following equations expresses the number of grams, g, of this sample that will be left after tyears? OA 1620 9= 30 -15.00 OB oc 9 = 30 - 157620 OD 9=301620