Anwita is on a geology feild trip and finds a rock that contains 38% of the original potassium-40, while remaining amount of potassium-40 had decayed into argon-40. The half - life of potassium-40 is 1.25 x 109 years. Assume the only decay product is argon- 40. How old is the rock in billions of years (109 years

Q: P-32 is an unstable isotope of phosphorus that has a half-life of 14.29 days. Atoms of P-32undergo…

A:

Q: 29) a rock from the moon was found to contain 1.0 x 10* g (A,) of uranium-238 and 4.0 x 10“ g…

A: The half-life of a radioactive isotope (t1/2 ): All radioactive decay first-order reaction kinetics.…

Q: In addition to C-14, K-40 is often used for archeological dating. K-40 decays to Ar- 40 by positron…

A: The rate of radioactive decay has been proven to be of first order kinetics. Using the understanding…

Q: How much time in minutes would it take for a 2.301 g sample of 3H to decay to a mass of 1.789 g if…

A: The initial concentration (N0), final concentration (N), and time (t) required to convert the…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by…

A: Since this is a first order decay The rate constant with half life is given by…

Q: Uranium-240 has a half-life of 14.1 hours (note this is NOT a fissionable isotope).  A country with…

A:

Q: A radioactive isotope has a half-life of 11 minutes.  How many grams of a 18.68 g sample remain…

A: Given Half life = 11minutes = 11*60= 660 second Sample weight = 18.68g Time = 44 minutes = 44*60=…

Q: -) The half-life of lodine-131 is 8.0252 days and the decay is first order. If 14.4 grams of 1-131…

A: Half life of iodine-131 (t1/2) = 8.0252 daysInitial amount of I-131 = [I-131]0 = 14.4 gamount of…

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…

A: Step 1:The U.S Apollo mission is estimated to be 4 billion years old.Mass of U238  is 1.245gHalf…

Q: Thorium-227 has a half-life of 18.4 days. How much will be left of a 100 mg sample in 60 days? Round…

A: Given a sample of Thorium 100 mg. And half life of Thorium-227 is 18.4 days.We have to calculate the…

Q: the half life of carbon-14 is 5730 years. how long does it take for 2.6 grams of carbon-14 to be…

A:

Q: The half-life of Polonium-218 is 3.00 minutes.  How many half-lives pass after 18.0 minutes ?  The…

A: Concept - Radioactive decays are first order reactions. So we use the formula, Nt = No(1/2)n, where…

Q: You have a sample of Bismuth-212 to prepare for an upcoming medical test.  This isotope has a…

A: The radioactivity follows first-order kinetics. The half-life relates to the rate constant, k for…

Q: 8. Strontium-90 has a half-life of 28.1 years. Starting with 2.08 mg of this isotope, what is the…

A: Radioactive decay follows first order kinetics. Using this we will calculate all parts of questions.

Q: How much time in minutes would it take for a 2.301 g sample of 3H to decay to a mass of 1.789 g if…

A:

Q: At the beginning of an experiment, a scientist has 244 grams of radioactive goo. After 105 minutes,…

A:

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 3.80 billion years old by…

A:

Q: 32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 62.7 g of 32P, how…

A:

Q: The half-life of 90Sr is 28.8 years. How long will it take (in years) for a 86.1 mg sample of 20Sr…

A: Given t= 28.8 years. t1/2 = ?

Q: Kr-81 has a half-life of 2.1 x 105 yr.  How many years does it take for 87.5% of this isotope to…

A: Since the decay reactions are first order reactions. And since we know that the relationship between…

Q: 4. You find a skull in a nearby Native American ancient burial site and with the help of a…

A:

Q: Californium-244 has a half-life of 19.4 minutes. If a researcher has 3.50 mg of Californium-244, how…

A:

Q: The half-life of carbon-14 is 5730 years. What does this statement mean? [A] It means that carbon-14…

A: Given: The half-life t12 of carbon-14 is 5730 years

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…

A:

Q: Bromine-88 is radioactive and has a half life of 16.3 seconds. What percentage of a sample would be…

A: Given,Half-life of Bromine-88 = 16.3 seconds.Percentage of sample left after 74.8 seconds has to be…

Q: A radioactive sample contains 9.5 x 1017 atoms of a nuclide that decays at a rate of 5.4 x 1013…

A:

Q: An element X has a half-life of 5250 years. It’s originally found in a fossil and weighs 12g. How…

A:

Q: A radioactive isotope emits 999 disintegrations per minute due to beta decay. If after 1.01 years…

A: Since the relationship between activity and time is given by  A0 e-λt = A where A = activity after t…

Q: If an ancient piece of wood is found to have one-sixteenth the original amount of carbon-14 in it,…

A:

Q: A moon rock collected by a U.S. Apollo mission is estimated to be 4.00 billion years old by…

A: Given: Half life of U235 , t1/2= 4.47x 109 yrsPresent time, t= 4.00 x 109 yrs mass of U238 = 1.430g

Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.