document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1204549>Question 1204549</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a uranium atom has a mass of 3.95 x 10^-22 grams. A sample of uranium has a mass of 9.085 x 10^-1 grams. Determine how many atoms are in the sample using scientific notation\r<BR>\n" );
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document.write( "please help I have a math test tomorrow </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #840867 by </B><A HREF=/tutors/aboutme.mpl?userid=math_tutor2020><B>math_tutor2020(3816)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_tutor2020><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=840867\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font color=black size=3><BR>\n" );
document.write( "For the sake of a simple example, let's say that one single atom of uranium has a mass of 2 grams. <BR>\n" );
document.write( "Of course this is way too large but it's for illustrative purposes only.\r<BR>\n" );
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document.write( "If we had a sample of 12 grams of uranium total, then we'd have 12/2 = 6 atoms.\r<BR>\n" );
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document.write( "Or in terms of algebra<BR>\n" );
document.write( "2n = 12<BR>\n" );
document.write( "n = 12/2<BR>\n" );
document.write( "n = 6\r<BR>\n" );
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document.write( "Let's return back to real-world figures now. \r<BR>\n" );
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document.write( "We'll have n still represent the number of atoms.\r<BR>\n" );
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document.write( "We multiply this value n with the mass of one atom of uranium. <BR>\n" );
document.write( "The expression (3.95x10^(-22))*n represents the total amount of mass, when we have n atoms of uranium.<BR>\n" );
document.write( "The x refers to multiplication and it's not a variable.\r<BR>\n" );
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document.write( "Set this equal to the stated total amount 9.085x10^(-1) and let's isolate n.<BR>\n" );
document.write( "(3.95x10^(-22))*n = 9.085x10^(-1)<BR>\n" );
document.write( "n = 9.085x10^(-1) divide (3.95x10^(-22))<BR>\n" );
document.write( "n = (9.085/3.95) x 10^(-1 - (-22) )<BR>\n" );
document.write( "n = <font color=red>2.3 x 10^21</font>\r<BR>\n" );
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document.write( "This number is really massive. We write 23 and then have 20 zeros after the number.<BR>\n" );
document.write( "The massive number is: n = 2,300,000,000,000,000,000,000<BR>\n" );
document.write( "I started with 2.3 and then moved the decimal point 21 spots to the right to arrive at the large number shown above. \r<BR>\n" );
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document.write( "Scientific notation is best suited for massive numbers like this.\r<BR>\n" );
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document.write( "Answer: <font color=red size=4>2.3 x 10^21 atoms</font><BR>\n" );
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