SCIENCE PLEASE HELP
posted by sam .
There are 3.29g of iodine 126 remaining in a smple originally containing 26.3 g of Iodine  126 the half life of Iodine  126 is 13 days. How old is the sample?
At study hall test is after lunch and cant figure out htese 2 on my review packet

WEll, follow the formula...
amountremaining=Original*e^(.692t/13)
3.29/26/3= e^(.692t/13)
take the ln of each side
.207 = .692t/13
solve for t in days.
Respond to this Question
Similar Questions

science help Please
There are 3.29g of Iodine 126 remaining in a smaple originally containing 26.3 g of iodine 126 the half life of iodine 126 is 13 days. How old is the sample? 
chemistry
Naturally occurring iodine has an atomic mass of 126.9045. A 12.3849 g sample of iodine is accidentally contaminated with 1.00070 g of ^129 I, a synthetic radioisotope of iodine used in the treatment of certain diseases of the thyroid … 
chemistry
Iodine131 is used to destroy thyroid tissue in the treatment of an overactive thyroid. the halflife of iodine131 is 8.02 days. if a hospital receives a shipment of 200.0g of iodine131, how much iodine131 would remain after 32 … 
Math
Please show me how to solve: Doctors can use radioactive iodine to treat some forms of cancer. The halflife of iodine  131 is 8 days. A patient receives a treatment of 12 millicuries of iodine  131. (A mullicurie is a unit of radioactivity.) … 
chemistry
Iodine131 has a half life of eight days. What mass of iodine131 would remain from a 20g sample after 32 days? 
chemistry
Iodine131, a beta emitter, has a halflife of 8 days.How many grams of a 10.0g sample of iodine131 would remain after 56.0 days? 
Exponential Growth and Decay
Doctors use iodine131 to treat some forms of cancer. The halflife of iodine131 is 8 days. A patient receives a treatment of 12 millicuries. A millicurie is a unit of radioactivity. How much iodine131 remains in the patient 16 days … 
Chemistry
How long will it take for a 18.0g sample of iodine131 to decay to leave a total of 2.25 g of the isotope? 
Science
Hi I've read everything and searched everything and I can't find the answer to this question so... How is iodine131 and iodine126 similar and how is it different? 
science
A Geiger counter is used to measure the activity of a sample of iodine131. Based on the data, what is the halflife of iodine131?