chemistry
posted by Anonymous .
Thallium 208 has a halflife of 3.053 min. How long will it take for 120g t decat ot 7.50g

k = 0.693/t_{1/2}
Substitute k into the equation below:
ln(No/N) = kt.
No = initial = 120g
N = final = 7.50g
k from above.
Solve for t.
Respond to this Question
Similar Questions

chemistry
If there are 80 milligrams of a radioactive element decays to 10 milligrams in 30 minutes then what is the elements half life in minutes? 
chemistry
The isotype caesium 137, which has a half life of 30 years, is a product of nuclear power plants. How long will it take for the amount of this isotype in a sample of caesium to decay to onesixteenth of its original amount? 
chemistry
Butadiene, C4H6, in the gas phase undergoes a reaction to produce C8H12. The following data were obtained for the reaction. [C4H6] Time (min) 1 0 0.98 20 0.91 100 0.66 500 0.49 1000 0.32 2000 0.25 3000 Determine the order of the reaction. … 
Chemistry
Gallium65, a radioactive isotope of gallium, decays by first orderkinetics. The halflife of this isotope is 15.2 min. How long would it take for 7/8 of a sample of this isotope to decay? 
Chemistry
IF 80mg of a radioactive element decays to 10mg in 30 minutes, the halflife of this element is a.10 min b.20 min c.30 min d.40 min the answer is a.10 min but i would like to know why, please help. 
chemistry
A particular radioactive substance has a halflife of 4 minutes. How long will it take for 250 g of this radioactive material to decay to less than 0.1g? 
Chemistry
Thallium208 has a half life of 3.053 min. How long will it take for 120.0 g to decay to 7.50 g? 
Chemistry
If the half life of Iodine131 is 8.10 days, how long will it take for 120.0 g to decay to 7.50g? 
Chemistry
Use the data in the table to determine how long it will take for half of the original amount of SO2Cl2 to decompose at the average reaction rate. Experimental Data for SO2Cl2(g) → SO2(g) + Cl2(g) Time (min) [SO2Cl2](M) [SO2](M) … 
chemistry
Initially you have 204 g grams of solid thallium at is at its melting point of 304ºC . How many grams of liquid thallium will be present after 476 joules of heat have been added. specific heat liquid thallium is 0.13j/g ºC; heat …