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The half-life of an element is 45 minutes. How much of a 7.0 mg sample is...
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?
The half-life of nitrogen-13 is approximately 9.97 minutes. How much of a 3 gram sample of nitrogen-13 would remain after 8 minutes? Round to three decimal places
The decay of antimony-131 is first order with a half life is 23.03 minutes. How much of 1.4228 g sample would remain after 1.368 hours?
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?
An unknown radioactive element decays into non-radioactive substances. In 760 days the radioactivity of a sample decreases by 77 percent.(a) What is the half-life of the element?half-life: (days)(b) How long will it take for a sample of 100 mg to decay to 68 mg?time needed: (days)
1. For a first order decay of [A], if 525 mg remains of an initial sample of 1.3079 g after 361 min, what is the half life (in minutes)? 2. The decay of antimony-131 is first order with a half life is 23.03 minutes. How much of 1.4228 g sample would remain after 1.368 hours? 3. The decay of antimony-131 is first order with a half life is 23.03 minutes. How long (in minutes) would it take for a 0.8893...
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?
If a 500. mg sample of technetium-99m is used for a diagnostic procedure, how much Tc-99m remains after each interval: (a) 12.0 h; (b) 24.0 h? (The half life of technetium-99m is 6.0 hours.) NINETE ch 5 attempts left Check my work SICH Be sure to answer all parts. If a 500. mg sample of technetium-99m is used for a diagnostic procedure, how much Tc-99m remains after each interval: (a) 12.0 h; (b) 24.0 h? (The half-life of technetium-99m is...
An isotope of cesium (Cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain? 14. Thallium-208 has a half-life of 3.053 min. How long will it take for 120.0g to decay to 7.500 15. Element-106 has a half-life of 0.90 seconds. If one million atoms of it were prepared, how many atoms would remain after 4.5 seconds? 16. A 2.5 gram sample of an...
4. A newly discovered isotope was found to have a half life of 30 minutes. How much of 100g of the isotope would remain after 2 hours?