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halflife
1. The halflife of a firstorder reaction is 9.89 minutes. How many minutes will have elapsed after 27 halflives? My answer is 267.03. 2. The halflife of a secondorder reaction is 2.508 days. How many days will have elapsed
asked by Issac on February 7, 2007 
chemistry
Some radioactive nuclides have very short halflives, for example, I31 has a halflife of approximately 8 days. Pu234, by comparison has a halflife of 24,000 years. Explain why both of these examples are dangerous, even though
asked by kenzie on June 7, 2018 
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? Ok i narrowed it down to either 10 or 30...but im rly confused so if u could help it wuld be
asked by jojo on March 4, 2007 
chemistry
How do you find the halflife of an element? Please explain and show me how to do this. I know the answer is 14.3 days, but I don't know how to work it. thank you! the problem is: After 42 days, a 2.0g sample of phosphous32
asked by Ryan on December 13, 2007 
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
asked by Harry on March 20, 2012 
Gen Chem
Neptunium239 has a halflife of 2.35 days. How many days must elapse for a sample of 239Np to decay to 1.00% of its original quantity? I got: close to 15 days. Is this right? I figured that about 1% of the original quantity
asked by Sarah H on March 28, 2008 
college
. S35 (t1/2 = 87.4 d) is used in cancer research. The biological halflife in the human body is 90 days. What is the effective halflife of S35?
asked by kurt on May 3, 2010 
college chem
S35 (t1/2 = 87.4 d) is used in cancer research. The biological halflife in the human body is 90 days. What is the effective halflife of S35?
asked by Anonymous on May 3, 2010 
math
You have just isolated a new radioactive element. If you can determine its halflife, you will win the Nobel Prize in physics. You purify a sample of 2 grams. One of your colleagues steals half of it, and eight days later you find
asked by Roseanne on October 21, 2012 
Chemistry
Mefenamic acid (Ponstan Forte) has a half life of 2 hours. Naproxen has a half life of 12 to 17 hours. Both are anti inflammatory drugs of apparently similar nature but could someone please explain the difference in half life?
asked by Mike on August 13, 2009