A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope of carbon. For a 1.0g sample of 13N, after one half-life, what mass of 13N remains? What has happened to the remaining mass?
B) 223Ra decays by alpha emission with a half-life of 11.43 days. For a 1.0g sample of 223Ra, after one half-life, what mass of 223Ra remains? What has happened to the remaining mass?
A)
After one half life period, mass of N-13 reduces to half from 1.0 g to .
The remaining mass is converted to .
B)
After one half life period, mass of Ra-223 reduces to half from 1.0 g to .
The remaining mass is converted to .
A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope...
A radioactive isotope decays by B" emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 B particles. During the next 1.0 min, the number of B- particles this sample will emit will be closest to 250. 500. O 1000. 1500. 2000.
The half-life of 82 35Br is 1.471 days. This isotope decays by the emission of a beta particle. a Gaseous HBr is made with Br-82. When the bromine isotope decays, the HBr produces H2 and the bromine decay product. Write a balanced equation for the decay of Br-82. Now, write a balanced equation for the decomposition of H82Br. b If a pure sample of 0.0150 mol of HBr made entirely with Br-82 is placed in an evacuated 1.00-L flask, how...
39Cl decays by emitting a ?- particle. This decay process has a half-life of 5.56×101 min. If the initial mass of a pure sample of this isotope is 8.47 µg, determine the number of 39Cl nuclei remaining after 6.010×102 min. Report your answer to three significant figures in scientific notation.
1.) What is the missing particle? 2.) Carbon-14 decays by beta emission and has a half-life of 5,730 years a.) Write the balanced equation for this reaction. b.) What percentage of a sample remains after 3,310 years? 3.) Bismuth-214 is an a-emitter with a half-life of 19.7 min. How long does it take for 75.0% of to decay?
Question 18 0 out of 1 points A radioactive isotope decays with a half-life of 8.02 minutes. If a sample of the isotope initially contains 5.00 g, what mass remains after 6.01 minutes? Selected Answer. 3.13 g Answers 2.979 1.139 1.87 g 3.139
The isotope 208^Tl undergoes β decay with a half-life of 3.1 min. (a) What isotope is produced by the decay? (b) How long will it take for 99.0% of a sample of pure 208Tl to decay? (c) What percentage of a sample of pure 208Tl remains un-decayed after 1.0 h?
An isotope of sodium, 24Na, has a half-life of 15 hours. A sample of this isotope has mass 9 g. (a) Find the amount remaining after 60 hours. 0.888 X 9 (b) Find the amount remaining after thours. y = (c) Estimate the amount remaining after 4 days. (Round your answer to three decimal places.) 9 (d) Use a graph to estimate the time required for the mass to be reduced to 0.01 g. (Round your answer to one decimal...
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
A 0.0116-g sample of a radioactive isotope with a half life of 1.3x109 years decays at the rate of 2.9x104 disintegrations per minute. Calculate the molar mass of the isotope. Enter your answer in scientific notation. (g/mol)
The half-life of a radioactive isotope is 2.5 min. If there are initially 48 Times 10^32 atoms of this isotope, (a) the number of atoms of this isotope remaining after 15 min is: 12 Times 10^32 7.5 Times 10^31 3 Times 10^32 6 Times 10^4 3 Times 10^2 (b) what is the decay constant? (c) What is the initial activity?