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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by josecqneto[/i] [br]Origin Ver. 8 Operating System: Windows 11 Hello, I have a DSC of the decomposition of CaCO3. There are basically 3 stages of decomp. (water, organic matter and CaCO3 -> CaO+CO2). I want to calculate the DeltaH of decomposition of the CaCO3. I have watched many videos online, I studied theory through the book Leng, 2008 to make sure I was good with theory. However, I can't seem to get a plausible value of DeltaH. For reference, I've seen values near 180 J/g or 180 kJ/mol, but I'm getting 12000 J/g. Can someone please help me understand if I'm doing something wrong here? I'm basically plotting time (s) per heat capacity (heat flux [mW] divided by mass [mg] = J/g.s) and then using peak analyzer to find out the area, which would theoretically be the heat of decomposition. I'm sending the data in 2 folders. One folder is what I got as a result and another one is the fresh data. https://drive.google.com/drive/folders/1Ovpo7Qu5pV9R8YiRmXbaqtJj_9fgyegx?usp=sharing Thank you so much! [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.