A hazardous material was found to decay at a rate proportional to the amount present. Initially, there were 50 mg of this radioactive material that was present. After two hours, it has lost 10% of its original amount. Find the mass of the material after four hours.

Q: Use your knowledge obtained while studying nuclear reactions to explain how the rate of decay of a…

A: The half-life of the given radioactive reaction is the time at which the reactant is disintegrated…

Q: Zinc-71 decays to a gallium-71 nuclide with a half-life of 2.45 minutes. What percent of a zinc-71…

A: We have to find out the percentage of zinc for the given question

Q: 30% of a radioactive substance has decayed after 10years, what is its half-life?

A:

Q: A pure sample of tritium, 3H, was prepared and sealed in a container for a number of years. Tritium…

A:

Q: If a rock contained 12.0 g of ⁴⁰K when the earth was formed 4.54 billion years ago and the half-life…

A: Given information is as follows; Initial mass of ⁴⁰K in the rock A0 = 12.0 g Final mass of ⁴⁰K in…

Q: eological site conta

A: Given N=2,400 decays/min m=500g=0.500kg Half-life 0f  C14 ,T12  =5,730 year

Q: While harder to access, another radioactive isotope of technetium, Tc-93, has a half-life of 2.73…

A: Solution Tc ninety nine m is wide used for diagnostic and therapeutic functions. It emits gamma…

Q: A substance has a half-life of 2.045 minutes. If the  initial amount of the substance was 132.8…

A: Given,  Half-life, t1/2  = 2.045 minutes Initial ammount, A0 = 132.8 gram

Q: 52. Estimating the Date That a Prehistoric Man Died The bones of a prehistoric man found in the…

A: Radioactive disintegration follows the first-order kinetics, i.e., the rate of the reaction depends…

Q: A piece of literature has announced that Uranium 238( 23822U) has a binding energy of approximately…

A: We can theoretically calculate the mass of a neutron. But this will be different from the…

Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life?

A: Given is the radioactive isotope.We know any radioactive decay follows first order  reaction…

Q: A 2.00 gram radioactive substance undergoes decay.  After 60 minutes, 1.50 grams have decayed.  What…

A: Radioactive decay generally follows first-order kinetics and for first-order kinetics:…

Q: A sample of Carbon is observed to have 15g left after an estimated time of 10000years. Determine the…

A:

Q: Cobalt-60 decays with a half-life of 5.27 years. What is the rate (in 1/yr) of decay?

A:

Q: If 7.0 grams of a sample decays to 0.44 grams in 2.0 hours, what is the half-life time of the…

A: For calculation of half life first of all we need rate constant of the reaction, which can be…

Q: How long will it take for a 40.0-gram sample of Iodine-131 to decay to 1/16th of its original mass?…

A:

Q: An unknown radioactive substance has a half-life of 3.20 hours. If  20.8 g of the substance is…

A:

Q: NUCLEAR REACTIONS Zinc-62 decays with a half-life of 9.186 hours. 1. Write the balanced nuclear…

A:

Q: A sample has a half life of 100 years. If it has been 200 years since it started to decay and there…

A:

Q: Tc-99 is often used in medicine and has a half-life of about 6 hours. if a patient is given 30.0…

A: First of all you need to find the radioactive decay constant of this nuclei. Which is nothing but -…

Q: At a certain instant, 100 grams of radioactive substance is present. After 20 years, 99.76 grams…

A: The half-life is the time required to change the initial amount to half of the amount. It is denoted…

Q: 3. A certain radioactive material is known to decay at a rate proportional to the amount present. If…

A: According to question, Given data, Initial amount of radioactive material = 50 mg,andAt time t = 2…

Q: Chemists working to develop substances for filtering greenhouse gases from the atmosphere have…

A: The decay differential equation is given as, dAdt = -kAA: Concentration at any time tK: Decay…

Q: An unknown radioactive substance is currently decaying. Initially, the sample contained 16.1g of the…

A:

Q: 187 Cs has a half-life of 30.2 years. How many years will it take for a 100.0-g sample to decay to…

A:

Q: A radioactive isotope decays from 60 grams to 15 grams in 20 seconds. What is its half-life? a) 20…

A: The radioactive decay is an example of first order reaction.

Q: Suppose a certain radioactive substance has a half-life of 2 years. Find how long it will take for…

A: Half life is the time of the reaction in which the reaction is 50% completed. Write the expression…

Q: A radioactive material decays at a rate proportional to its amount. If the material has a half-life…

A: To solve this question, first find out rate constant using half life and then use that to find out…

Q: After 60 days, 10 grams of radioactive isotope remains from an original 80 g sample. What is the…

A: Law of radioactive decay: Law of radioactive decay relates the amount radioactive substance…

Q: Proton-85 has a half-life of 10 years. Approximately what percentage of Kr-85 produced from the…

A: Half life of Kr-85 = 10 yr % of Kr remain active = ?

Q: At a given time, there are 1.2 mg of a radioactive substance present. After 6 hours there is only…

A: To solve this question, first find out the rate constant of radioactive substance and using that…

Q: A vial of radioactive material is found at a site where it was left unattended. At the time the vial…

A: Given : Initial mass of reactant = 10 g And mass of reactant after 4 days = 8 g

Q: The radioactive substance neptunium -139 decays to 72.85% of its original amount after 28 hours. How…

A: For radioactive decay, relation between rate constant and its concentration is give below.…

Q: Carbon-14 has a radioactive half-life of about 6,000 years. If an organism has 10 g of carbon-14 in…

A: Provided half life (t1/2)=6000year Also, provided time(t)=6000year Initial amount (A•)=10g of…

Q: On April 26, 1986, an explosion at the nuclear power plant at Chernobyl Ukraine, released the…

A:

Q: How much of a 0.230 g radioactive sample with a half-life of 8 hours would remain after a period of…

A:

Q: A certain substance is known to decay at a rate proportional to the present amount. Initially, there…

A: Radioactive decay is the first order reaction.The half life time for a radioactivedecay is given by…

Q: A 180.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured…

A:

Q: 11A and 11B

A: Since the decay rate is proportional to the concentration or mass of carbon Hence d[C]/dt = -K[C]…

Q: If you have 2.00 grams of a radioisotope, with a half-life of 5 days, how much of the isotope is…

A: Given;

Q: After 60 days, 10 grams of radioactive isotope remains from an original 38 g sample. What is the…

A:

Q: If 1.50 gram of a 2.00 gram sample of a radioactive substance undergoes decay in 60 minutes, then…

A:

Q: A rock contains 0.257 mg of lead-206 for every milligram of uranium-238. The half-life for the decay…

A: The first-order rate law can be transformed into another highly useful equation with the decay…

Q: With a half-life of 6.56 minutes, aluminum-29 decays to silicon-29 nuclide. After 18 minutes, what…

A:

Q: A certain radioisotope has a half-life of 9.54 days. What percentage of an initial sample of this…

A:

Q: A wooden artifact from an ancient tomb contains 30 percent of the carbon -14 that is present in…

A:

Q: The isotope Np-238 has a half life of 2.0 days. If 96 grams of it were present on Monday, how much…

A: Here given, The half-life of Np-238 (t1/2)= 2 days. Initial amount present (N0) = 96 g Time (t) = 6…

Q: The activity of a particular radioactive nuclide falls from 1 × 1011 Bq to 2 × 1010 Bq in 10 hours.…

A: