![]() For example: Fe, H 2.Ī Group object is a parenthesized list of ChemElem or Group objects, with a positive integer repetition count for the whole group. The exception is that e by itself represents an electron.Īn ChemElem object is a chemical element with a positive integer repetition count. For example, these are elements: H, Na, Uuq. How it works Data representationĪ raw chemical element is a string of letters that begins with an uppercase letter and is followed by any number of lowercase letters. In this case, each term that has a negative coefficient should be put on the other side of the equation, and its new coefficient should be the absolute value of the negative coefficient. Note: For simplicity of implementation, if the equation is successfully balanced but one or more terms have a negative coefficient, the program doesnât consider this outcome to be an error condition. This error should not happen, but if it does please contact me. The author/programmer made a serious logic mistake. There is no workaround the code would need to be rewritten to use bigints. I donât expect this error to occur for real-world chemical formulas, only deliberately contrived ones. Your equation used numbers that are too big, or a term has an element that occurs too many times, or the internal calculation used numbers that are too big. Furthermore, the equation can be separated as H â H 2 and O â O 2, each of which does have a unique solution. For example, H + O â H 2 + O 2 has no unique solution because two solutions are 2H + 4O â H 2 + 2O 2 and 6H + 2O â 3H 2 + O 2, which are not multiples of each other. Your equation can be considered as two or more independent equations added together. There exist multiple solutions to your equation that are not simply multiples of each other. For example, C â N 2 has no solution because the only solution is 0C â 0N 2. The only mathematical solution to your equation has all coefficients set to zero, which is a trivial solution for every chemical equation. Check each letter carefully, and follow the examples as a guide to the correct syntax. Your input does not describe a proper chemical equation. Syntax guide Feature & demoįoo 5+ + Bar 3â â FooBar 2 + FooBar â The source TypeScript code and compiled JavaScript code are available for viewing. This program was hand-written in JavaScript in year 2011, received minor feature updates and clarifications and refactorings throughout the years, and was ported to TypeScript in 2018. Because the program is entirely client-side JavaScript code, this web page can be saved and used offline. ![]() The algorithm used is GaussâJordan elimination, slightly modified to operate using only integer coefficients (not fractions). The program calculates the coefficients to balance your given chemical equation. This is an easy-to-use, no-nonsense chemical equation balancer. In the following table for this reaction:Ĭlick on image below to see a pictorial representation of this.Chemical equation balancer (JavaScript) Program Input: If all elements are balanced, the equation is balanced. If each side of the equation has the same number of atoms of a given element, that element is balanced. Step 2: Count the number of atoms of each type on each side of the equation (for the reactants and for the products). In the total number of atoms present for each type of molecule.Ĭlick here if you would like to see molecules broken into atoms. Count the number of each type of atom in each type of molecule. ![]() Step 1: Break each molecule up into the individual atoms. To see if the equation is balanced, we can follow two steps: If this equation is balanced, the same atoms (in number and identity) will be present as reactants and products. Was the chemical equation previously discussed balanced? Let's take a closer look: That is written so this is true is said to be balanced. Need to be present at the end of the reaction as products. All of theĪtoms that were present at the beginning of the reaction as reactants also This law has an effect on the coefficients of a chemical equation. In a chemical reaction, atoms can notīe created or destroyed they simply rearrange themselves to form new products. You surely have heard that matter can not be created or destroyed.
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