Posted by **Monique** on Saturday, November 26, 2011 at 11:38am.

A radioactive sample contains 2.45g of an isotope wiht a half life of 3.8 days. How much of the isotope in grams remains after 11.4 days?

please explain

- chemistry -
**DrBob222**, Saturday, November 26, 2011 at 12:58pm
k = 0.693/t_{1/2}

Solve for t_{1/2} and substitute into the equation below.

ln(No/N) = kt

No = starting grams = 2.45 g

N = ending amount. Solve for this.

k = from above calculation.

t = 11.5 days.

- chemistry -
**Anonymous**, Thursday, March 7, 2013 at 6:03am
0.30625

- chemistry -
**Anonymous**, Tuesday, December 8, 2015 at 10:48pm
.30625

- chemistry -
**saviour**, Thursday, July 28, 2016 at 6:05am
100g of radioactive mass has a half life of 5days.calculate the mass decayed off aafter 15days

- chemistry -
**saviour**, Thursday, July 28, 2016 at 6:08am
100g of radioactive mass has a half life of 5days.calculate the mass decayed off aaftGood day sir, My Name is Oyindamola from Enterprise ware Technologies(Mr Seun Aina-Scottâ€™s Company)

Please be reminded that your Microsoft Office Account is due to expire on the 22nd August,2016

It has to be renewed so as to prevent the account from being suspended sir

Thanks

Oyinmartins

Support Executive

er 15days

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