Thursday
March 23, 2017

Post a New Question

Posted by on Tuesday, May 31, 2011 at 9:15pm.

A radium-226 sample initially contains 0.112mol. How much radium-226 is left in the sample after 6400 years. The half-life of radium-226 is 1600 years.

  • chemistry - , Tuesday, May 31, 2011 at 10:29pm

    long way.
    k = 0.693/t1/2
    ln(No/N) = kt
    No = 0.112 mol
    N = unknown
    k from above.
    t = 6400 years.

    shorter way.
    0.112*(1/2^n)
    0.112*(1/2^6400/1600)
    0.112*(1/2^4) = N

  • chemistry - , Monday, April 22, 2013 at 3:30am

    0.04 is the answer

  • chemistry - , Monday, July 28, 2014 at 4:10pm

    The half-life of Radium -226 is 1600 years. How much Ra 226 remains in a 30.0 g sample after 6400 years?

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question