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I cant grasp half life - the study guide question is how is half life dating used by scientists -... The half-life of I-131 is 8.00 days. If a medical treatment involves a dose of 400. mg of I-131, how... If the half-life of a 20.0g is known to be 24 minutes, how long will it take for only 5.0 grams of t... The half-life of P-32 is 14 days. How long after a sample is delivered can a laboratory wait to use... 3. The half-life of a certain drug in the human body is 8 hours how long it would take for a dose... The half-life (t1/2) of a first order reaction is 0.100 s. What is the rate constant? a. 6.93 s-1... The half-life for the first-order conversion of A to B is 56.5 hours. How long does it take for the... 1. What is the half-life of Strontium-90? Explain your answer. Honestly I don't know how to get t... The half-life of Th-232 is 1.4E10. Find the number of disintegrations per hour emitted by 1 mol of T... The half life of Am-241 is 432 y. If 2.00 g of Am-241 is present in a sample, what mass of Am-241 is... The half-life for the second-order reaction of a substance A is 58.2 s when A0 = 0.63 mol L-1 Calcul... 1. The half-life for the (first-order) radioactive decay of 14C is 5730 yr (it emits a β ray wit... what is the half-life of the nuclide Consider that the half-life of Polonium-210 is 140 days.What approximate daily percentage of decay d... i know that the half life of strontium 90 half-life is 28.8 but how can i explain this??? If the half life of Ir - 131 is 42 days, how much would be remaining after 168 days? If the half life of Pu-239 is 2.4 x 10^4 years, how many years are required for a 20-gram sample of... The​ half-life of a certain radioactive element is about 1500 years. After 2800 ​years, what per... K-42 has a half-life of 12.4 hours. If you begin with 250g of K-42, determine how much you will hav... What is the half-life of the element Lokium? The half-life of xe-133 is 126 hours. Starting with 250 mg, after 500 hours around how many mg remai... Ba-140 has a half life of 13.0 days. What fraction of a sample will remain after 39 days? ok so i got... the half life of carbon-14 is 5730 years, the relation c+(1/2)^ N/5730 is used to ca... The half-life for the second-order reaction of a substance A is 55.8 s when concentration of initial... What is the half-life of an isotope if it decays to 12.5% of its radioactivity in 18 minutes? The half-life for the first-order decomposition of is 1.3*10^-5. N2O4--> 2NO2 If N2O4 is int... Ba has a half-life of 283.2 hours. How long would it take for the 50 mg of Ba in a sample to decay t... The half-life for the first order reaction of a substance A is 50.5 s. How much time is needed for t... If C14 has a half-life of 4,000 years, what fraction will be remaining after 36,000 years? If I 131 has a half-life of 8 days, what fraction will be left after a year? Given that the half life of c 14 is 5,700 ,use the method c 14 dating to determine the age of a fos... I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disinteg... If the half-life of a first-order decomposition reaction is 24.2 minutes, how long will it take for... What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.... If 6.90 g of (half-life = 5.30 y) are allowed to decay, how many grams would be left after 1.00 y a... The half-life of the following first order reaction is 231 seconds. What percent of the original con... If the half-life of a certain radioactive substance is 2000 years, estimate how many years must elap... 1. The half-life of a first-order reaction is 9.89 minutes. How many minutes will have elapsed after... What is the half-life (in h) for the decomposition of O3 when the concentration of O3 is 2.37 ✕ 10−6... half life carbon -14 is 5,730 years. If you start out 50 grams, how long will it take until it reach... Iodine-131 has a half life of eight days. What mass of iodine-131 would remain from a 20g sample aft... The half-life for the process 238U 206Pb is 4.5 109 yr. A mineral sample contains 45.9 mg of 238U an... The half life of the radio active substance is the time require the half the substance to decay. th... The half-life of an element is important for determining the _______ of a rock. A. relative age B.... The half life of a radioactive sample is 6.93 days.after how many days will only one -tenth of the s... Cesium-137 has a half life of 30.0 years. If initially there are 8.0 kg of cesium-137 present in a... Carbon-14 has a half-life of approximately 5,730 years. How many half-lives have occurred in a sampl... Nitrogen-13 has a half-life of 10 minutes. Given a starting mass of 2.00 g of nitrogen-13, how many... Carbon-15 has a half-life of 5730 years. As observed from Earth, what would the half-life of carbon-... The half- life of a positron is very short. it reacts with an electron, and the masses of both are c... the half life of oxygen-15 is 124 s. if a sample of oxygen-15 has an activity of 4000 Bq, how many m... the half-life of an element x is is 5 days, if we have 5g of x initially, what is the mass x after 2... the half-life of cobalt-60 is 5.20 years.. how many milligrams of a 2.000-mg sample remains after 6.... To bobpursley, the half life is 40.(potassium 40) The half life of phosphorus -32 is 14.3 days. What percentage of an original samples radioactivity r... Half life of given sample is 44 years . The sample will reduce to 50 % of the original value after ?... The half life of a radioactive element X is 5days, if there is 5g of X initially, what will be the m... carbon 14 has a half life of 5715 years. If you start with a 5 gram sample of 14C, what mass is left... The half-life of Radium-223 is 11.43 years. What is the annual decay rate? Express the result to fou... Barium – 122 has a half-life of 2 minutes. Suppose you obtain a sample weighing 100.0 g and it takes... Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half life of 2.48 * 10^5 years Thor... Pu-239 has a half-life of 24110 y. If 1.00 kg of this isotope is present in the used fuel rods of a... The half-life of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g... The half-life of a reaction was found to be inversely dependent on the concentration of the starting... Potassium-42 has a half life of 12.4 hours. How much of an 848 g sample of potassium-42 will be left... The half-life of carbon-14 is about 5700 years. You find a piece of cloth painted with organic dye... The half life of Carbon-14 is 5730 years. How much of a 1.00g sample of Carbon-14 will remain after... If the half-life of a radionuclide is 1 month, is a sample of it completely decayed after 2 months? Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a s... sodium-24 has a half life of 15 hours,how much of a 50 gram sample will be left after 60 hours cobalt-60 has a half-life of 5.26 years, how much of a 500 gram sample will be left after 21 years Half-life is a measure of the rate of decay of an isotope. True False I think it is false? Calculate the half-life (in s) of a first-order reaction if the concentration of the reactant is 0.0... The half life of a certain radioactive substance is 10 years. How long will it take for 18 gms of th... The half life of gold-197 is 10.6. What fraction of a sample remains after 21.2 years? A certain drug has a half-life of about 2 hours in blood stream. The drug is formula to be administe... The half-life of a first order reaction is determined to be 85.5 years. How long will it take for th... Carbon-14 has a half-life of 5730 years In a plant fossil you find that the 14 C has decayed to 1/8... The half-life of hafnium-156 is 0.025 s. how long will it take a 560 g sample to decay to one-fourth... If the half life of Iodine-131 is 8.10 days, how long will it take for 120.0 g to decay to 7.50g? the half life of thorium -229 is 7340 years. how long will it take for sample of this substance to d... The half-life of Carbon-14 is 5730 years. What is the age of a fossil containing 1/16 the amount of... Carbon-14 has a half-life of 5730 . In a plant fossil, you find that the has decayed to 1/32.0 of th... How to work out: The half-life of Indium-116 is 14 seconds. How long will it take for 32g of this is... if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days The half-life of Radium-226 is 1590 years. If a sample contains 100 mg, how many mg will remain afte... A material has a half-life of 12 hours. If initially there are 4 grams of the material, how much is... The half-life of a radioactive material is about 34.6 years. How much of a 1-gram sample of the mate... Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will... The half-life for the radioactive decay of calcium-47 is 4.5 days.If a sample has an activity of 4.0... Tritium (half-life = 12.3 y) is used to verify the age of expensive brandies. If an old brandy conta... If the radiological half life of a material is 31 minutes, and you have 77 grams now, how much did... The half life of iodine - 131 is 8 days. How long will it take for 7/8 of the sample to decay? 11) The Half-Life of Tylenol is approximately 3 hours. If you take 1000mg, how Tylenol much is left... The half -life of carbon-14 is 5,730 years.how much of an initial amount of this substance would re... Iodine-131 has a half-life of 8 days. How many grams of a 12 g sample will remain at the end of 40 d... Tritium (half-life= 12.3 y) is used to verify the age of expensive brandies. If an old brandy contai... a half-life of uranium-235 is 700,000,000 years. The half-life of uranium-238 is 4.463x10^11 years l... the half-life of radon-222 is 3.823 days. what was the original mass if 0.050g remains after 7.646 d... The half-life of Radium-223 is 11.43 days. If a sample has a mass of 900 mg, find the mass (i...