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Chemspread PROScreenshot 

 

Free Java Applet is a chemistry spreadsheet calculator - balances virtually any chemical equation and follows up with stoichiometry calculations as well as equillibruim calculations. Percentage mass, titrations, ideal and non-ideal gases. Knows the periodic table and computes molecular weight of all entries. Partial pressures and Van der Waal equation. Gravemetric analysis. Includes tutorial. Free demo at mathshowcase.com

Screenshot of Chemspread PRO