Homework Help: chemistry

Posted by Shay on Monday, September 24, 2012 at 4:42pm.

It takes 1 hour and 17 min. for a 1.000g sample of a certain isotope to decay to 0.121g. What is the half-life of this isotope? plssss helpp

chemistry - DrBob222, Monday, September 24, 2012 at 4:47pm
ln(No/N) = kt.
No = 1.000
N = 0.121
t = 67 min
solve for k, then
k = 0.693/t_1/2

Answer this Question

Related Questions

Science chemistry - It takes 1 hour and 17 min. for a 1.000gsample of a certain ...
Chemistry - Gallium65, a radioactive isotope of gallium, decays by first order-...
Chemistry - It takes about 10^16 years for just half the samarium-149 in nature ...
geo/science - could you please tell me if this is the correct formula for ...
math grade 12 - 2. An isotope of sodium has a half-life of 15 h. A sample of ...
math - A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. ...
math - A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. ...
math - A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. ...
math - A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. ...
math - A 10 kg quantity of a radioactive isotope decays to 3 kg after 17 years. ...

For Further Reading

First Name:
School Subject:
Answer: