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class="hidden-xs hidden-sm"> <button class="btn btn-default btn-block text-xs-center" data-toggle="modal" data-target="#modal-feedback" style="margin-bottom: 10px"><i class="fa fa-send"></i> Feedback</button> </div> </div> <div class="col-md-9" id="main-column"> <h1 class="page_title"> Stoichiometry <a href="#" class="mark-page-favorite pull-right" data-pid="343" title="Mark as favorite" onclick="return false;"><i class="fa fa-star-o"></i></a> </h1> <ol class="breadcrumb"> <li><a href="../../../chemistry.html"><i class="fa fa-home"></i> Home</a><i class="fa fa-fw fa-chevron-right divider"></i></li><li><span class="gray">Stoichiometry</span></li> </ol> <article id="main-article"> <div class="intro-card" readonly="false"><img class="intro-image" readonly="true" src="../../images/stoichiometry/scales-1333455_640.jpg"> <div class="content" readonly="true"> <p class="text">Chemists often need to measure the quantities of elements and compounds reacting. Stoichiometry means<em> measuring elements. </em>Atoms of different elements (and sometimes the same element too) have different masses, so we need to take that into account when calculating reacting masses. The 'big numbers' that we put in front of formulae in chemical equations are the <em>stoichiometric coefficients.</em> Stoichiometry involves the concept of the <em>mole.</em></p> </div> </div> <div class="yellowBg"> <div class="index-list"> <div class="item"> <div class="bg-cover cover-96" onclick="window.location='/chemistry/page/717/particulate-matter-and-chemical-change'" style="background-image: url('../../images/test-images/aurora_borealis.jpg')" title="Particulate matter and chemical change"> </div> <div class="content"> <h4 class="head"><a href="../717/particulate-matter-and-chemical-change.html">Particulate matter and chemical change</a></h4> <p class="body">Writing formulae and chemical equations is a fundamental skill of a chemist (it is also a universal language).</p> </div> </div> <div class="item"> <div class="bg-cover cover-96" onclick="window.location='/chemistry/page/722/the-mole-concept'" style="background-image: url('../../images/test-images/themoletoo.png')" title="The mole concept"> </div> <div class="content"> <h4 class="head"><a href="../722/the-mole-concept.html">The mole concept</a></h4> <p class="body">A mole is simply a number, specifically Avogadro's number (<em>L</em>) which is 6.02 ×10<sup>23</sup>. It is the number of atoms in exactly 12g of pure carbon-12.</p> </div> </div> <div class="item"> <div class="bg-cover cover-96" onclick="window.location='/chemistry/page/724/reacting-masses-and-volumes'" style="background-image: url('../../images/test-images/nahco3reaction.jpg')" title="Reacting masses and volumes"> </div> <div class="content"> <h4 class="head"><a href="../724/reacting-masses-and-volumes.html">Reacting masses and volumes</a></h4> <p class="body">There is not a great deal of knowledge to learn in order to be confident with mole calculations, but you may well need lots of practice.</p> </div> </div> </div> </div> <hr class="thin"><div class="row"><div class="col-md-12"><br><ul class="resources"><li class="resource-item"><div class="img-container"><img class="thumb thumb-cover" src="../../images/test-images/aurora_borealis.jpg"></div><div class="media-body"><h4 style="font-size: 19px;"><a class="text-normal" href="../717/particulate-matter-and-chemical-change.html">Particulate matter and chemical change</a></h4><p class="body">Topic 1.1
Introducing some basic concepts.</p></div></li><li class="resource-item"><div class="img-container"><img class="thumb thumb-cover" src="../../images/test-images/nahco3reaction.jpg"></div><div class="media-body"><h4 style="font-size: 19px;"><a class="text-normal" href="../724/reacting-masses-and-volumes.html">Reacting masses and volumes</a></h4><p class="body">Topic 1.3
Lots of 'moles questions'; understanding ratios is the key.</p></div></li><li class="resource-item"><div class="img-container"><img class="thumb thumb-cover" src="../../images/test-images/themoletoo.png"></div><div class="media-body"><h4 style="font-size: 19px;"><a class="text-normal" href="../722/the-mole-concept.html">The mole concept</a></h4><p class="body">Topic 1.2
Explaining what a mole is (spoiler: it's just a number).</p></div></li></ul></div></div> <div id="modal-feedback" class="modal fade" tabindex="-1" role="dialog"> <div class="modal-dialog" role="document"> <div class="modal-content"> <div class="modal-header"> <h4 class="modal-title">Feedback</h4> <button type="button" class="close hidden-xs hidden-sm" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">×</span> </button> </div> <div class="modal-body"> <div class="errors"></div> <p><strong>Which of the following best describes your feedback?</strong></p> <form method="post" style="overflow: hidden"> <div class="form-group"> <div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Recommendation"> Recommend</label></div><div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Problem"> Report a problem</label></div><div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Improvement"> Suggest an improvement</label></div><div class="radio"><label style="color: #121212;"><input type="radio" name="feedback-type" value="Other"> Other</label></div> </div> <hr> <div class="row"> <div class="col-md-6"> <div class="form-group"> <label for="feedback-name">Name</label> <input type="text" class="form-control" name="feedback-name" placeholder="Name" value=" "> </div> </div> <div class="col-md-6"> <div class="form-group"> <label for="feedback-email">Email address</label> <input type="email" class="form-control" name="feedback-email" placeholder="Email" value="@airmail.cc"> </div> </div> </div> <div class="form-group"> <label for="feedback-comments">Comments</label> <textarea class="form-control" name="feedback-comments" style="resize: vertical;"></textarea> </div> <input type="hidden" name="feedback-ticket" value="082b9c9c4ae3624d"> <input type="hidden" name="feedback-url" value="https://studyib.net/chemistry/page/343/stoichiometry"> <input type="hidden" name="feedback-subject" value="7"> <input type="hidden" name="feedback-subject-name" value="Chemistry"> <div class="pull-left"> </div> </form> </div> <div class="modal-footer"> <button type="button" class="btn btn-primary btn-xs-block feedback-submit mb-xs-3 pull-right"> <i class="fa fa-send"></i> Send </button> <button type="button" class="btn btn-default btn-xs-block m-xs-0 pull-left" data-dismiss="modal"> Close </button> </div> </div> </div></div> <style type="text/css" media="screen">/* Important part */
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