![]() important calculation and it depends 100 on doing good stoichiometry. product molecular weight × limiting reagent moles × product stoichiometry. ![]() It is a very mathematical part of chemistry, so be prepared for lots of calculator use. Stoichiometry deals with calculations about the masses (sometimes volumes) of reactants and products involved in a chemical reaction. You may use ideal gas calculator to check it. Now that we have the number of moles of O2, we use the balanced chemical equation. In this article, well look at how we can use the stoichiometric relationships contained in balanced chemical equations to determine amounts of substances. Calculate the theoretical yield of a chemical reaction using our calculator. The word stoichiometry derives from two Greek words: stoicheion (meaning 'element') and metron (meaning 'measure'). However, phosphine is a gas - it will be nice to know what is its volume. In fact we have only two significant digits in data, so it should read 4.5g, but program is somewhat generous when it comes to displaying digits.Īt this moment we can take a look at the reaction summary - or even print it, just in case: Stoichiometric amount of phosphine evolved is displayed in the lower, output frame below phosphine formula - and it reads 4.479 g. Ready! Entered amount of water is displayed in red, to signal it is in excess. Now it's time for stoichiometry - enter known amounts of reagents - 12 into mass edit field below edit field with calcium phosphide formula and 20 into edit field below water formula. Program does its part of the work and displays balanced equation and calculated molar masses. In the upper, input frame, enter formulas of both reactants (Ca 3P 2, H 2O - you may select water from the program database if you want) and products (PH 3 and Ca(OH) 2 - note that you don't need any tricks to correctly display the formulas, just enter letter, digits, and parentheses). Click once on the add reactant button and once on the add product button to prepare room for all reagents. As in the case of most questions in chemistry, you have to start with balancing chemical equation.Ĭreate new reaction, clicking on the New button on the tool bar. ![]() This is a classic stoichiometry problem - limiting reagent question. Calculate mass of phosphine PH 3 evolving when 12g of calcium phosphide Ca 3P 2 is added to 20g of water. ![]()
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