Posted by **Matthew** on Sunday, March 17, 2013 at 11:03pm.

A quantity of oxygen gas had 16.32 g of the radioactive isotope oxygen-19 in it. When measured exactly 10 minutes later, the amount of oxygen-19 was 0.964 g. What is the half-life, in seconds, of oxygen-19?

- math -
**Reiny**, Monday, March 18, 2013 at 12:05am
16.32(1/2)^(t/k) = .964 , where t is in minutes, and k is the half-life in minutes.

(.5)^(10/k) = .0590686.. ( I stored it)

ln both sides

(10/k) ln .5= ln (.059068...)

10/k = 4.081464...

k = 2.4504 minutes or 147.006 seconds

## Answer This Question

## Related Questions

- math - I asked the following the other day and received the following answer: ...
- chemistry - how many molecules are in 5.5 moles of oxygen gas? How many atoms ...
- Math - D.E.Q. - The half-life of a radioactive isotope is the amount of time it ...
- Chemistry - The half-life of oxygen -15 is 124 seconds. If a sample of oxygen -...
- Calculus - My teacher wants me to use this formula for half life question C(t...
- Physics - How many grams of water (H_2O) have the same number of oxygen atoms as...
- chemistry - The half-life of oxygen-15 is 124 s. If a sample of oxygen-15 has an...
- chem - the half life of oxygen-15 is 124 s. if a sample of oxygen-15 has an ...
- Physcis 30 - Q1) If there are 100 radioactive atoms with a half-life of 30 ...
- math - What is the figure that gives the half-life of the isotope in minutes to ...

More Related Questions