Chemistry
posted by Jay .
How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s
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
How long will it take for 25% of the C14 atoms in a sample of C14 to decay? 
Math
The halflife of strontium90 is 28 years. How long will it take a 60 mg sample to decay to a mass of 15 mg? 
College Chemistry
How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s 
calculus
The rate at which an amount of a radioactive substance decays is modeled by the differential equation dA/dt = kA, where A is the mass in grams, t is the time in years, and k is a constant. Answer the following. a) If a 100gram sample … 
Chemistry
Uranium238 has half life of 4.51 * 10^9 years Uranium234 has half life of 2.48 * 10^5 years Thorium230 has half life of 8.0 * 10^4 years Radium226 has half life of 1.62 * 10^3 years Lead210 has half life of 20.4 years. The rate … 
Chemistry
The halflife of C14 is 5700 years. If it took seven half lives for a sample of C14 to decay completely, how many years would have gone by? 
UIW
Neptunium239 has a halflife of 2.35 days. How many days must elapse for a sample of 239Np to decay to 0.100% of its original quantity 
SCIENCE
We did a radioactive decay and half life lab with m&ms and I do not understand these conclusion questions: 1. how many half lives would it take for 500 nuclei to decay to 6.25% of the original number of nuclei? 
halflife
the half life of isotope X is 2.0 years how many years would it take for 4.0 mg sample of X to decay and have .50 mg of it remain?