Textbook Question
The nuclide 6Li reacts with 2H to form two identical particles. Identify the particles.
666
views
Ch.20 - Radioactivity and Nuclear Chemistry
Chapter 20, Problem 93
A 1.50-L gas sample at 745 mm Hg and 25.0 °C contains 3.55% radon-220 by volume. Radon-220 is an alpha emitter with a half-life of 55.6 s. How many alpha particles are emitted by the gas sample in 5.00 minutes?
Verified step by step guidance1
Convert the initial conditions of the gas sample to standard units: pressure in atm and temperature in Kelvin.
Use the ideal gas law, PV = nRT, to calculate the total number of moles of gas in the sample.
Determine the volume percentage of radon-220 in the gas sample and calculate the moles of radon-220 using the percentage given.
Calculate the initial number of radon-220 atoms using Avogadro's number.
Use the half-life of radon-220 to determine the number of alpha particles emitted in 5.00 minutes by applying the decay formula: N(t) = N_0 * (1/2)^(t/half-life).
Related Practice
Textbook Question
The half-life of 238U is 4.5⨉109 yr. A sample of rock of mass 1.6 g produces 29 dis/s. Assuming all the radioactivity is due to 238U, find the percent by mass of 238U in the rock.
1213
views
Textbook Question
The half-life of 232Th is 1.4⨉1010 yr. Find the number of disintegrations per hour emitted by 1.0 mol of 232Th.
762
views
1
comments
Open Question
A 228-mL sample of an aqueous solution contains 2.35% MgCl2 by mass. Exactly one-half of the magnesium ions are Mg-28, a beta emitter with a half-life of 21 hours. What is the decay rate of Mg-28 in the solution after 4.00 days? (Assume a density of 1.02 g/mL for the solution.)
Open Question
When a positron and an electron collide and annihilate each other, two photons of equal energy are produced. What is the wavelength of these photons?
Open Question
The half-life of 235U, an alpha emitter, is 7.1⨉108 years. Calculate the number of alpha particles emitted by 1.0 mg of this nuclide in 1.0 minute.