Asked by malia
There are 5g of 131I left after 40.35 days. How many grams were in the original sample if its half-life is 8.07 days?
What is the half life of a radioisotope if you started with 1 gram and 0.250 grams is left after 6 days?
im not looking for a free answer, I've tried working it out with what the teacher gave us and cannot figure these out, thank you :)
What is the half life of a radioisotope if you started with 1 gram and 0.250 grams is left after 6 days?
im not looking for a free answer, I've tried working it out with what the teacher gave us and cannot figure these out, thank you :)
Answers
Answered by
DrBob222
There are 5g of 131I left after 40.35 days. How many grams were in the original sample if its half-life is 8.07 days?
<b> Look up the half life of I-131 (that may have been given in the problem) and use it to calculate k for the decay. k = 0.693/t1/2
Then ln(No/N) = kt
You know N, k and t, solve for No. </b>
What is the half life of a radioisotope if you started with 1 gram and 0.250 grams is left after 6 days?
ln(No/N) = kt. You know t, No = 1 grams; N = 0.250 g. Solve for k, then
k = 0.693/t1/2. Knowing k you can calculate t1/2.
Post your work if you get stuck.
<b> Look up the half life of I-131 (that may have been given in the problem) and use it to calculate k for the decay. k = 0.693/t1/2
Then ln(No/N) = kt
You know N, k and t, solve for No. </b>
What is the half life of a radioisotope if you started with 1 gram and 0.250 grams is left after 6 days?
ln(No/N) = kt. You know t, No = 1 grams; N = 0.250 g. Solve for k, then
k = 0.693/t1/2. Knowing k you can calculate t1/2.
Post your work if you get stuck.
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