document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=283117>Question 283117</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A 5000g sample of Iodine-131 decayed into 312.5 grams in 2.025 days.  What is the half-life of Iodine-131? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #205551 by </B><A HREF=/tutors/aboutme.mpl?userid=Greenfinch><B>Greenfinch(383)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Greenfinch><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Greenfinch><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=205551\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 5000/312.5 = 16 so it has decayed to 1/16 of the original. 16 is 2^4, so 4 half-lives.<BR>\n" );
document.write( "2.025 days = 2916 minutes. So 1 half-life is 729 minutes or 12 hours 9 minutes </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );