document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=824265>Question 824265</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A beaker contains 450 g of water (H2O). If 9.2 g of calcium fluoride (CaF2) is added, what is the molality concentration of the solution? (1 point)\r<BR>\n" );
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document.write( "Select one:\r<BR>\n" );
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document.write( "a. 0.020 m \r<BR>\n" );
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document.write( "b. 0.26 m \r<BR>\n" );
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document.write( "c. 0.35 m \r<BR>\n" );
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document.write( "d. 4.8 m  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #496458 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39800)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=496458\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Molality means moles of solute per kilogram of solvent.<BR>\n" );
document.write( "Formula weight of CaF2 is 78.07 grams per mole.<BR>\n" );
document.write( "Solubility of CaF2 at 20C is 0.0016 grams per 100 ml of solution.<BR>\n" );
document.write( "This solubility is close to 0.0002 moles per kilogram water.\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%289.2%2AgramsCaF2%29%2A%281%2Amole%2F%2878.07%2AgramsCaF2%29%29%2F%280.45%2Akg%2Awater%29 ALIGN=MIDDLE  ALT=\"%289.2%2AgramsCaF2%29%2A%281%2Amole%2F%2878.07%2AgramsCaF2%29%29%2F%280.45%2Akg%2Awater%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%289.2%2F78.07%29%281%2F0.45%29 ALIGN=MIDDLE  ALT=\"%289.2%2F78.07%29%281%2F0.45%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=highlight_green%280.26%29 ALIGN=MIDDLE  ALT=\"highlight_green%280.26%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > moles CaF2 per kilogram water.  This must certainly be wrong because the data in the question is faulty.  You cannot have 0.26 m CaF2 if the solubility can only be 0.0002 m. </SPAN>\n" );
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