Answer
.812 grams
Work Step by Step
half life of 72 years
100 grams, 500 years
$y=100*(.5)^{500/72}$
$y=100*(.5)^{6.9444}$
$y=100*.008119$
$y=.8119$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.