![]() The recent recommendations on the Interpretation and use of standard atomic weights, as well as the information on the isotopic composition, may also be of use for you in that case. specific isotopes) or elements, feel free to download this app and modify the periodicTable to suit your needs. If you don't agree with my assertions regarding atomic weights or need some specific atomic weights (i.e. For the isotopes with no natural occurrence, I simply took the atomic mass of the stablest ones (see Table 2 in the UIPAC publication).For instance, for O, the midpoint of, corresponding well to the atmospheric oxygen, is 15.9994, while the abridged value is 15.999 solely because of the limitation of 5 significant digits per an abridged value. Only in cases of O and Tl, where due to rounding the abridged values lie slightly outside the recommended ranges, the midpoint was taken. For those elements the weight of which is given in a certain range, e.g., '' for H, a recommended 'abridged' value was taken (1.008 for H), because if the exact source of the element is unknown, this, and not the range midpoint, is believed to correspond better to the most probable average atomic weight of these atoms in your average sample.In such cases, I took the precise value: e.g., 58.933194 for Co. The first one contains the elements for which a value with the corresponding uncertainty is given: e.g., '58.933 194(3)' for Co.Based on how the atomic weight is defined therein, there are three categories of elements. The weights were parsed from the tables grabbed directly from the references above. The atomic weights and names of the elements which are used here were approved by IUPAC and CIAAW in 2021-2022 and are contained in the periodicTable variable in the chemCalc.js file. In any case, if you don't believe me, you can easily check it out by testing it manually or inspecting the source code before using it in any crucial calculations. I'd say that, as of now, the app is time-tested and should be quite reliable. This means that both "H2 + O2 = H2O" and "H2 O2=H2O" are valid, and the second one is obviously easier to type. The reagents or products must be separated with at least one whitespace or "+" character. Well, this is pretty straightforward - type the formula or equation, and voilĂ ! The only thing that comes to my mind that isn't obvious is related to the separators in the equation input. If you'd like to do this, though, please make sure to refresh the page before saving, because I've noticed that the browser sometimes does something weird when you save the page with the calculation results already in it. a complete webpage) and use it without Internet access. ![]() It is written in vanilla JS and works offline in the browser (that is, in any more or less modern Firefox and Chrome-based browser). This is a very small app that allows you to calculate molar masses, balance chemical equations, and compute the product or reagent masses. ![]()
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