Uranium-235 has a half-life of 7.04 x 108 years. How many years will it take for 99.9% of a U-235 sample to decay? O 7.0 x 109 yr O 4.7 x 109 yr 1.0 x 106 yr 4.9 x 109 yr

Q: Cobalt-60, which undergoes beta decay, has a half-life of 5.26 yr.    If you start with 2.44 g of…

A: Interpretation: The amount of beta particles are emitted in 125 days is to be calculated from the…

Q: The half-life of Phosphorus-32 is 14.3 days. If you start with 100 grams of it, how long will it…

A: Half life of a first order reaction is given by , t1/2=0.693k Write the expression for first order…

Q: Iodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days. A…

A: Half life of iodine -125 = 59.5 daysInitial amount of iodine -125 = 2.00 kgFinal amount of iodine…

Q: The half-lives of different radioisotopes are given in the table. Radioisotope Half-life (min)…

A: We know that,→ Radioactivity Phenomena follow first oroen kinetics.So, Rate = KA1 K → Rate…

Q: The number of radioactive nuclides in a sample decays from 3.80 x to 1020 19 9.50 x 10 in 58.0…

A:

Q: The half-life of radioactive radium (226Ra) is 1599 years. What percent of a present amount of…

A: Chemical changes in which species amount varies linearly along with time basically obey"first-order…

Q: Yttrium-90 is a radioactive isotope used to treat tumors in the liver. 90 Y has a half-life of 2.67…

A: Given : Half life of 90Y = 2.67 days. And mass of 90Y remaining after 1.03 days = 4.02 µg

Q: Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137…

A:

Q: Iodine-125 (125I) is used to treat, among other things, brain tumors and prostate cancer. It decays…

A:

Q: How long does it take for 78% of a sample of cobalt-60 to decay (the half-life is 5.26 years)?

A: To solve this problem we have to first calculate the rate constant of the reaction by using half…

Q: Calcium-45 has a half-life of 162.61 days. If 4 mg of this isotope remains after 300 days, what is…

A: Radioactive decay follows first-order kinetics. The half-life of the first-order reaction does not…

Q: Bismuth-209 has a half-life of 2.01 x 1019 years.  How long will it take for 6.92 kg of bismuth-209…

A: We have to predict the time taken.

Q: The radioactive nuclide 55Co has a half-life of 17.5 hours. What mass of 55Co remains from a 0.0100…

A:

Q: The half-life of thorium-227 is 18.72 days. How many days are required for three-fourths of a given…

A:

Q: Radioactive Radon-222 gas (222Rn) occurs naturally as a product of uranium decay. The half-life of…

A:

Q: Cesium-137 is part of the nuclear waste produced by uranium-235 fission. The half-life of…

A: Half-life of Cs-137 and initial mass, from which amount of Cs-137 left after 90.6 years.

Q: You analyze a sample of a meteorite that landed on Earth and find that 15/16 of the uranium-238…

A: The question is based on the concept of chemical kinetics. we have been given a radioactive material…

Q: that reads 452 g. How much sample is left after half an hour? 5.00 g 90.4 g 14.1 g 75.3 g

A:

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: 10. The half-life of tritium (hydrogen-3) is 12.3 years. If 48.0 milligrams of tritium is released…

A: 10. Given,Half-life of tritium Hydrogen-3 = 12.3 yearsTritium released from a nuclear power plant…

Q: Naturally occurring uranium is composed mostly of 238U and 235U, with relative abundances of 99.28%…

A: Given, relative abundance : U238=99.28 % U235=0.72% Half life : t1/2 of U238=4.5×109 yr t1/2 of…

Q: How much time is required for 84% of the isotope to decay?

A: Given: Iodine-131, which is used to treat thyroid cancer, has a half-life of 8.04 days. The…

Q: What is the mass of 35.5 micrograms of uranium-235 after 1.12 billions years. Uranium-235 has a…

A: Given that, Initial mass of U-235= 35.5 microgram Half-life = 700 million years After time t= 1.12…

Q: The half-life of nickel-63 is 100.1 years. If there are 100 grams of nickel-63 present at a certain…

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: 187Pb has a half-life of 15.2 s.  If a sample of this isotope is initially 750.0 g, what mass of the…

A: The objective of this question is to find out the remaining mass of the Pb-187 isotope after 18.5…

Q: 8. The radioactive decay of Tl-206 to Pb-206 has a half-life of 4.20 min. Starting with 5.00 × 1022…

A: The number of such Tl-206 atoms left after 42.0 min is calculated as,

Q: Iodine-125 is a radioactive isotope commonly used in medicine. It has a half-life of 59.5 days.…

A:

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.