Chemistry
posted by Anonymous .
32P is a radioactive isotope with a halflife of 14.3 days. If you currently have 48.1 g of 32P, how much 32P was present 3.00 days ago?

Using halflife, calculate rate constant, k, from the following
k = 0.693/t_{1/2, then substitute k into the following ln(No/N) = kt No = unknown N = 48.1 g. k from above. t = 3 days.}
Respond to this Question
Similar Questions

12th grade Math  word problems
#1.) The population of bacteria after t hours is given by P(t) = 500/(1+83.33e^0.162t) a.) What is the initial population? 
Physics 30
The activity of a sample of a radioactive isotope is 1800Bq. If this isotope has a halflife of 16 days, what is the activity after 16 days? 
chemistry
A radioactive sample contains 2.45g of an isotope wiht a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days? 
chemistry
A radioactive sample contains 2.45 g of an isotope with a halflife of 3.8 days. How much of the isotope in grams will remain after 11.4 days? 
chemistry
Radioactive decay is a process that follows firstorder kinetics. The halflife of 32P is 0.03920 years; how long (in minutes) would it take for the amount of 32P to decrease to 53.25% of its initial amount? 
Algebra
Two different radioactive isotopes decay to 10% of their respective original amounts. Isotope A does this is 33 days, while isotope B does this in 43 days. What is the approximate difference in the halflives of the isotopes? 
PreCalc
A radioactive isotope has a half life of 8.1 days. If the sample starts with 25 grams, how much will there be after 90 days? 
statistics
I have tried for days to figure out how to work this problem. Please help show me how to find the answer. A particular radioactive isotope decays from 210 mg to 182.7 mg in 15 days. Find the half life of the isotope. 
Calculus
My teacher wants me to use this formula for half life question C(t) = Ce^kt but i used a different formula plz help. the question is: A radioactive isotope has a half life of 30 years. If we started off with 10 mg of this isotope … 
chemistry
The radioactive isotope, phosphorus32, has a halflife of 14.26 days. How much phosphorus32 will remain after 60 days?