Radium decomposes at a rate proportional to the amount present. If half of the original amount disappears after 811yrs, what is the percentage lost in 100 years?

Q: the half life of oxygen-15 is 2 minutes. what fraction of a sample of O-15 will remain after 5…

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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: What is the half-life of a radioactive substance if after 5 years 95 percent of an initial amount…

A: Half life of a given radioactive substance is that time duration in which it's amount reduced half…

Q: The half-life of element X is 500 years. If there are initially 8 g of X, how much will remain after…

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

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Q: technetium-99 has a half-life of 6.0 hours. How many gramsin a 24.0 gram sample will remain…

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Q: The vast majority (99.6%) of argon in Earth's atmosphere is 40Ar however the argon in the Sun is…

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Q: Cesium – 137 has a half life of 30 years. How much of a 100 mg sample is left after 120 years?

A: A numerical problem based on half-life period, which is to be accomplished.

Q: Technicium-104 has a half-life of 18 minutes.If the initial mass is 100.0g,how much remains after 90…

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Q: A sample of Thorium-228 has a half life of 1.9116 years. what percent of thorium 228 remains after…

A: Let the initial amount be A0After the first half-life the amount remaining is

Q: Given that radioactive cobalt-60 has a radioactive constant equal to 3.8 x 10 determine its…

A: Now in order to calculate the half life we first write down the given data: Radioactive…

Q: What is the half-life of an element that begins with 100g, and 18.8g remains after 113 minutes.

A: Half life of radioactive element-is the time needed for given number of its nuclei to decay exactly…

Q: Barium -122 has a half life of 2 minutes. Suppose you obtain a sample weighing 10.0g and it takes 10…

A: Since the decay reactions are first order reactions. Hence the half life of reaction will remain…

Q: If 50% (1/2)of a radioactive element remains after 4000 years, what is the half-life

A: Half life of a radioactive element is the time required to disintegrate into it's half…

Q: The half life of Carbon-14 is 5730 years. Calculate what percentage of C-14 will remain after 17,190…

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Q: The half-life of mercury-203 is 46.6 days. What percentage of mercury-203 remains in a sample after…

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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: The half-life of carbon-14 is about 5715 years. A sample contains 1 gram of carbon-14. How much will…

A: Formula for half life,  N (t )= No(1/2)t/t1/2 where, N (t) = quantity of the substance remaining…

Q: Radium‑226 (atomic mass = 226.025402 amu) undergoes α‑decay to form radon‑224. The half‑life of this…

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Q: A to 240mg sample of technetium 99M is used for a diagnostic test. if Technetium -99m has a…

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Q: Radium-223 has a half-life of 11.43 days. How long will it take for 80% of a sample of the said…

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Q: Radium decomposes at a rate proportional to the amount at any instant. In 100 years, 100 mg of…

A: Radium (Ra) is an element that belongs to group 2 of the periodic table and lies in the sixth…

Q: How many grams will be left after 100 days if you have 150 g of thorium-234 at the beginning?…

A: Given,  The mass in grams will be left after 100 days of the decay, if initial amount of Th-234 is…

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

A: Given, Half Life , t1/2 = 28 days First, calculate rate constant ,K to calculate time (t)

Q: If we start with 1.000 g of strontium-90, 0.953 g will remain after 2.00 yr. (a) What is the…

A: As we know, that Radio active decay follows first order kinetics. Rate constant for first order…

Q: If a tree dies and the trunk remains undisturbed for 1.895 × 10ª years, what percentage of the…

A: Mass% is equal to the ratio of the mass of the given substance to the total mass of the substance.…

Q: The half-life of iron-59 is 44.5 days. How much of a 3.00-mg sample will remain after 222.5 days?

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Q: Based on Plutonium's half-life, why is it so hard to dispose of?

A: According to research,  Plutonium has two isotopes, Pu-239 and Pu-241.  Here, Plutonium-239 has a…

Q: The half-life of phosphorus-33 is 25 days. How much of a 128-g sample will remain after 150 days?

A: Let initial amount of P-33 present initially long year back = Ao = 128 g Final mount of P-33 present…

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

A: This is a first order reaction where the radioactive substance disintegrates. The half life time of…

Q: The​ half-life of​ silicon-32 is 710 years. If 20 grams is present​ now, how much will be present…

A: Radioactive decay is always a first order reaction. The rate equation for the radioactive decay is :…

Q: The half-life of Radium-226 is 13 years. How much of an initial 179 g sample will remain after 36…

A: Radio active reactions are first order reactions. Decay constant (k) = 0.693 / t1/2 Where, t1/2 =…

Q: How much of a 15 gram sample of radium-225 would remain after 5 days

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Q: If 20% of the radioactive substance disappears in one year, find its half-life assuming exponential…

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Q: The half-life of 90Sr is 29 years. What fraction of the atoms in a sample of 90Sr would remain 175…

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Q: Barium -122 has a half-life of 2 minutes.  Suppose you obtain a sample weighing 10.0g and it takes…

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Q: 3. If the half-life if Iridium-182 is 15 minutes, how much of a 1 gram sample is left after 45…

A: Radioactive isotopes always undergo first order reaction. And the rate of reaction for first order…

Q: The half-life of Oxygen-15 is 2 minutes. What fraction of a sample of O-15 will remain after 5 half…

A: Given,half-life = 2 minutesNeed to find out the fraction remaining after five half-lives.

Q: c. What mass of Cs will be left in a 24.0 g sample of Cs after 90 years? d. What fraction of Cs-137…

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Q: What

A: We will calculate energy in nuclear fusion

Q: Nitrogen -13 has a half-life of 10 minutes .What amount of a 16 mg sample would remain after 30…

A: Nitrogen-13 has a half-life of 10 minutes. How much of a 16 mg sample would remain after 30 minutes.…

Q: A certain radioactive substance has a half life of 50 hours that is half of the original quality has…

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Q: An unknown sample contains radioactive element U-235, If the original amount present is 3500 atoms,…

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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: Cs – 137 has a half life of 30.2 years. How many years will it take for a 100.0 g sample to decay to…

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Q: Radium has a half-life of 1600 years. How many years does it take for 90% of a given amount of…

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Q: the half-life of aluminum 26 is .74 million years. Suppose an asteroid contained 800 kg of aluminum…

A: The half-life of aluminum 26 is 0.74 million years. The mass of aluminum 26 present in asteroid is…

Q: Thorium-227 has a half-life of approximately 19 days. What percentage of an original amount of…

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