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Iridium-192 is one radioisotope used in brachytherapy, in which a radioactive source is placed inside a patient\'s body to treat cancer. Brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. Iridium-192 is often used in the head or breast. Answer the following three questions (a, b, and c) based on the radioactive decay curve of iridium-192, shown below. Theres a graph, but i dont know how to use it
a) If the initial sample is 1.75 g, what mass of the original iridium-192 remains after 5 days?
b) Estimate the half-life of the radioisotope.
c) How many days would it take for one-fourth of the sample to decay?
The solubility product of Mg(OH)2 is 1.2E-11. What minimum OH- concentration must be attained (for example, by adding NaOH) to decrease the Mg2+ concentration in a solution of Mg(NO3)2 to less than 1.9E-10 M?
when .65 moles of iron metal react with 40.0 mL of a 2.5 M copper (II)chloride solution to produce copper metal and iron (III) chloride. How many moles of copper will be produced?
The empirical formula of a solid is AB2 and it dissolves to form the cation A2+ and the monoanion B-.Solid AB2 is added to water and allowed to reach equilibrium.
if CO2 gas is collected over water at 25 degrees C and 775torr, what is the partial pressure of the CO2? The vapor pressure of water at 25degrees C is 23.8torr.
what is the minimun number of coulombs required to produce 1.06 mol of gold?
Determine the theoretical yield and percent yield if 21.8g of K2CO3 is produced by reacting 27.9g KO2 with 29.0L of CO2 (one mole of CO2 occupies 22.4L). The GFW (KO2)= 71.10 , GFW (K2CO3)= 138.21 , GMW (CO2)= 44.01
A certain second-order reaction (B--> products) has a rate constant of 1.40×10^-3 M^-1*s^-1 at 27 Celsius and an initial half-life of 280s . What is the concentration of the reactant B after one half-life?
a bicycle tire is filled with air to a pressure of 100 psi at a temperature of 100 degrees C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees C. the volume of the tire is increased by 4%. what is the new..
What is the molar concentration of Br^- ions in a 0.235 M aqueous solution of FeBr3, assuming complete dissociation?
how long will it take for the concentration of A to decrease from 1.0 M to 0.25 M? If [Bo] = 1.5 M, what will be the concentration once [A] = 0.25 M?
Why is it important to use lambda max (measured from spectroscope)? What I am unclear about is why it is important to know it before creating a standard curve?
If in an experiment 42g of CO is burned with excess oxygen gas. Calculate how many grams of CO2 will be formed in the process.
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