The half-life of molybdenum-99 is 67 h. A 200 microgram (mg)quantity decays, over time, to 25 mg. How much time has elapsed?

Q: It takes 4 h 39 min for a 2.00-mg sample of radium-230 to decay to 0.25 mg. What is the half-life of…

A: Half life of first order kinetic reaction is given by:

Q: Barium-142 is an beta emitter with a half-life of 11.0 min. If we start with 2.500 g of 142Ba, what…

A: The number of half-lives (n) can be calculated as

Q: The half-life of radioactive chromium-51 is 28 days, If a sample of chromium-51 has a mass of 12.0…

A:

Q: (Q121) Technetium-99 is an unstable isotope used in various medical procedures. Given a half life of…

A: Given: half life (t12)=8.01 hrsmass=1.41 ug To find: Activity in Ci

Q: If the half-life of a parent material is 10 Ma, and about 88% (rounded) has decayed to daughter…

A:

Q: An old piece of wood has a carbon-14 content of 0.0156 times that 14 is the age of the old wood if…

A: We will use first order kinetics formula

Q: Cobalt 60 has half-life of 5.25 years. Given 1 mg of the substance, find  (b) the decay constant,…

A:

Q: Co-60 is used extensively in radiotherapy. Its half-life is 5.27 years. How many years will it take…

A:

Q: Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. How…

A: We have to predict the time taken.

Q: -33. The number of radioactive nuclides in a sample decays from 1.00 × 1020 to 2.50 × 10º in 10.0…

A:

Q: 31. Uranlum 235 decays to Lead 207 with a half-life of 0.7 billion years. What Is age of a rock…

A:

Q: Carbon-14 has a half-life of 5730  years . In a plant fossil, you find that the  14C  has decayed to…

A:

Q: The half life of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain…

A: given :-  initial amount of sample = 500 mg  half life = 1590 years  To calculate :-  amount of…

Q: Fluorine-18 is a radioactive isotope commonly used in medicine.  It has a half-life of 110 minutes.…

A:

Q: Carbon-14 has a half life of 5730 years. In a plant fossil, you find that the 14C has decayed to…

A: Given that, half life , t12= of 5730 years. and  14C has decayed to 1/8.00 of the original amount

Q: The half-life of radium-226 is 1600 years. How long will it take for 10.0 mg of radium-226 to decay…

A:

Q: Iodine-131, in a sodium iodide tablet, is used to measure the activity of the thyroid gland. If a…

A: Nuclear chemistry is a branch of chemistry which involved the study of reactions in the nucleus. The…

Q: The half-life of protactinium-231 is 3.25 x 104 years. How long will it take for 43.4 grams of…

A: Find out the time period by using the formula, Where,              Ao = Initial amount  At = Amount…

Q: If 29.5% of the original amount of 14C is present in a wooden tool at the time of analysis, what is…

A: Since the carbon decay is a first order kinetics reaction Hence for the first order reaction we can…

Q: 1. What is the half-life of a radioactive isotope if a 500.0g sample decays to 62.5g in 24.3 hours

A:

Q: The half life of radium -226 is 1590yrs . If a sample contains 400mg, how many mg will remain after…

A: Given;

Q: The half life of radium 226 is 1602 years. If you have 500 grams of radium today how many grams…

A:

Q: How many of the nuclei of a radioactive sample containing 2048nuclei decay in 3 years, if its half…

A: The number of nuclei of a radioactive sample containing 2048 nuclei that decays in 3 years is to be…

Q: The isotope 100 Tc has a half life of 16 sec, what is the radioactive decay constant, k?

A: Given: Half life of isotope 100Tc = 16sec As all radioactive process are first order reactions using…

Q: A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at…

A: GIVEN:  To Find: Solution: As we know, For First order decay

Q: carbon as a piece of modern charcoal. How long ago was the tree burned to make the ancient charcoal?…

A:

Q: 1. If the amount of the parent isotope in the original sample of a rock had been 48 grams, about how…

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: A 85.0-mg supply of iodine-131, used in hospitals in the treatment of hyperthyroidism, was stored…

A:

Q: The half-life of copper-67 is 61 hours.  If an original sample contains 24 grams how many grams are…

A:

Q: The half-life of radiogold is approximately 3 days. If 1.5 g of this has been administered to a…

A:

Q: Cobalt-60 is commonly used as a source of beta-particles. How long does it take for 87.5% of a…

A: Radioactive decay is associated with the emission of small energetic particles e.g. beta particles,…

Q: The half-life of Palladium-100 is 4 days. After 12 days a sample of Palladium-100 has been reduced…

A: The initial mass of the sample of palladium-100, No, in mg is calculated as shown below where t1/2…

Q: Plutonium-236 is an alpha emitter with a half-life of 2.86 years. How long will it take for the 1.20…

A:

Q: How many days would it take for a 1.0 milligram sample to reach this level if the half-life…

A: Since the decay reactions are first order  hence we can say 2 things about them  1) half life =…

Q: 239Pu is a nuclear waste byproduct with a half-life of 24,000 y. What fraction of the 239Pu present…

A: Given data, t1/2 of P239u = 24,000 yTime (t) = 1000 years To calculate the fraction of the 239Pu…

Q: 3.) The Radioactive nuclide co has a half-Life of 8.5 hours, 55 27 what mass of Co Temains from a.…

A: Mass of sample remains after 18 hours is       0.0045 g.

Q: How many milligrams remain of a 15.0 mg sam- ple of radium-226 after 6396 years? The half-life of…

A:

Q: The half-life of Th-232 is 1.4 x 10^10 years. If there are 50.0 g of the sample left after 5.6 x…

A: Calculate number of half-life:

Q: A substance X initially weights 56 grams. After 6 minutes, it was observed that its mass decreased…

A: Mass at starting (t=0) = 56 grams Mass after 6 min = (56-12) g                                = 44 g…

Q: Strontium-89 has a half-life of 84 days. (a) Explain the meaning of the underlined phrase. (b) A…

A: a) Half-life of 84 days means it will take 84 days for Strontium-89 to reduce to 1/2 of its initial…

Q: Radium-226, which undergoes alpha decay, has a half-life of 1600 yr. (a) How many alpha particles…

A: All radioactive decay processes follow first order reactions. Calculating rate constant for first…

Q: If a rock contained 12.0 g of 4°K when the earth was formed 4.54 billion years ago and the half-life…

A:

Q: 3.7. The radioactive nuclide Co has a half-life of 5.27 years. Calculate the mass of Co that remains…

A: Rate of a reaction determines the speed with which a reaction proceeds. First order reaction is a…

Q: The half life of radium-226 is 1600 years. How many grams of a 0.25g sample will remain after 4800…

A: After decying the nucleus it emits radiation of electromagnetic rays ,of certain Wavelength.

Q: the half life of molybdenum -99 is 67 hr. a 200 ug quantity decays, over time, to 25 ug. how much…

A: Here given, Initial amount (N0) = 200 ug Amount left undisintegrated (N) = 25 ug Half life (t1/2) =…

Q: Strontium-89 is a beta emitter with a half-life of 50.6 days that is used in bone cancer treatment.…

A: Radioactive decay follows first order kinetics. t1/2 = 0.693/k   (where, k = decay constant) t =…

Q: Strontium-90 has a half life of 28 years. If a 5.31 mg sample was stored for 112 years, what mass of…

A: Reaction in which rate is linearly depend upon one reactant is known as first order reaction.