Thursday

October 23, 2014

October 23, 2014

Posted by **Sarah** on Tuesday, April 12, 2011 at 11:24pm.

Half life=7.2 minutes

- Half-Lifes -
**DrBob222**, Tuesday, April 12, 2011 at 11:35pmk = 0.693/t

_{1/2}

Substitute k into the equation below.

ln(No/N) = kt.

No = 6

N = unknown

k = from above

t = 7.2 min

I get approximately 4 g remaining.

- Half-Lifes -
**Sarah**, Tuesday, April 12, 2011 at 11:41pmGreat! But, so that I can understand it in the future, can you tell me what the value of k is a little more clearly? how do you do a subscript of 1/2?

- Half-Lifes -
**DrBob222**, Wednesday, April 13, 2011 at 12:34amThe half life is given in the problem (last line you typed) of 7.2 minutes.

I write a t_{1/2}

To turn on subscript type < followed by sub followed by >. Then type the 1/2. To turn subscript off type < followed by /sub followed by >

**Answer this Question**

**Related Questions**

science - If the half-life of a 20.0g is known to be 24 minutes, how long will ...

chemistry - If there are 80 milligrams of a radioactive element decays to 10 ...

Biology - The half -life of carbon-14 is 5,730 years.how much of an initial ...

Half-Life - Uranium-238 decays to Lead-206. The half life of Uranium-238 is 4.5 ...

Chemistry - Which radioactive sample would contain the greatest remaining mass ...

chemistry - use the nuclear decay equation to find out how much a 7mg sample of ...

chemistry - the half-life of polonium-218 is 3.0 minutes. what percentage of the...

Chemistry - The most abundant isotope of the element nobellum has a half-life of...

half-life - 1. The half-life of a first-order reaction is 9.89 minutes. How many...

College Algebra - Use a calculator to help solve the problem. One isotope of ...