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If you start with 7.0×1010I7.0×1010I-131 atoms, how many are left after approximately 1 month? II-131 has a half-life of 8.0 days.
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- Radioactive element AA can decay to either element BB or element CC.The decay depends on chance, but the ratio of the resulting number of BB atoms to the resulting number of CC atoms is always 2/1.The decay has a half-life of 8.00 days.We start with a sample of pure AA. How long must we wait until the number of CC atoms is 1.50 times the number of AAatoms?12 2.5 g. Q7. Pd-100 has a half-life of 3.6 days. If one had 6.02 x 1023 atoms at the start, how many atoms would be present after 20.0 days?By READING the N vs t graph shown below, determine No & the half-life. N (x10¹ atoms) 120 90. 60. 30. 1 2 3 4 5 6 7 8 9 10 t(y) No = half-life = atoms
- How much energy in kJ is released to form one mole of 75As from protons, electrons, and neutrons if the nucleus has a mass of 74.921594 amu? The masses of the proton, electron and neutron are 1.00728 amu, 0.000549 amu and 1.00867 amu, respectively. -3.15e10 kJ/mol -6.31e10 kJ/mol -6.31e13 kJ/mol 3.15e13 kJ/molThe cadmium isotope 109Cd has a half-life of 462 days. A sample begins with 1.0 × 1012 109Cd atoms. How many are left after (a) 50 days, (b) 500 days, and (c) 5000 days?Question 12 of 22 Calculate the mass defect of Nitrogen (A = 14, Z = 7). The atomic mass of Nitrogen is 14.00307 u. (Note: The mass of a hydrogen atom is mH = 1.007825 u, and the mass of the neutron is mN = 1.008665 u.) 00 1.21 u 0.53 u 0.25 u 0.11 u zero
- Cobalt-60 and iodine-131 are used in treatments for some types of cancer. Cobalt-60 decays with a half-life of 5.27 years, emitting beta particles with a maximum energy of 0.32 MeV. Iodine-131 decays with a half-life of8.04 days, emitting beta particles with a maximumenergy of 0.60 MeV.(a) Suppose a fixed small number of moles of each of these isotopes were to be ingested and remain in the body indefinitely. What is the ratio of the number of millisieverts of total lifetime radiation exposure that would be caused by the two radioisotopes?(b) Now suppose that the contact with each of these isotopes is for a fixed short period, such as 1 hour. What is the ratio of millisieverts of radiation exposure for the two in this case?Q۲: Calculate the radioactivity of 0.5mg of cobalt 56 in units of curie? Its radioactivity is 50 days, knowing that its half-life is equal to 78.5 days. If you know that the number of Avocadro is equal to 1023 x 6.02 mol / g Translated text: ar-en Q۲: Calculate the radioactivity of 0.5mg of cobalt 56 in units of curie? Its radioactivity is 50 days, knowing that its half-life is equal to 78.5 days. If you know that the number of Avocadro is equal to 1023 x 6.02 mol / gHow many kilograms of water are needed to obtain the198.8 mol of deuterium, assuming that deuterium is0.01500% (by number) of natural hydrogen?
- Given the atomic masses below, calculate the exact nuclear binding energy (in MeV to 4 SD) of a N-15 atom. Neutron = 1.008665 u Hydrogen atom = 1.007825 u Proton = 1.007276 u Nitrogen-15 atom = 15.000109 uThe relationship between the half-life time and the rate constant of a zero order reaction is given by a. t1/2 = In 2/k b. t y = k Co C. t 2 = Co / (2k) d. t 2 = 1/(k Co) e. t ½ In (k co)The radioactive cobalt isotope, 60Co, has an half-life of 63 months and undergoes decay. The molar massof 60Co is 59.9338222 amu. A sample initially contains 48 mg of 60Co.(a) Calculate the number of moles of 60Co that are left in the sample after 5.0 years. (4)(b) Calculate the activity of 60Co after 5.0 years, in units of per month (month1).