Sunday

November 23, 2014

November 23, 2014

Posted by **John** on Thursday, April 25, 2013 at 11:38am.

- A.P. Chemistry -
**DrBob222**, Thursday, April 25, 2013 at 2:20pmThe simple answer:

It will take 1.4E10 years.

If the half life is 1.4E10 and you want exactly 1/2 of the Th to decay, it will take just one half life. right?

You can work it out.

k = 0.693/t_{1/2}

ln(No/N) = kt.

No = 1.0 mg

N = 0.5 mg

k from above.

Solve for t.

You should obtain 1.4E10 years.

**Answer this Question**

**Related Questions**

AP Calculus - An Initial amount of 100 grams of Thorium-234 decays according to ...

Chemistry - Uranium-238 has half life of 4.51 * 10^9 years Uranium-234 has half ...

p - A uranium nucleus (mass 238 u), initially at rest, undergoes radioactive ...

physics - A uranium nucleus (mass 238 u), initially at rest, undergoes ...

Algebra - The level of thorium in a sample decreases by a factor of one-half ...

algebra - The level of thorium in a sample decreases by a factor of one-half ...

math - The mass m(t) remaining after t days from a 70 g sample of thorium-234 is...

Physics check - A Thorium-232 absorbs a neutron and the resulting nucleus ...

Chemistry - The half-life of Th-232 is 1.4E10. Find the number of ...

chemistry - How long will it take for 25% of the C-14 atoms in a sample of C-14 ...