N(C 4H 10) = 0.367 g/58.0 g/mol = 0.00633 molĪnd after this, we divide the heat of the reaction by the number of moles of butane, to get the heat of the reaction per mole of butane: To find the number of moles, we use the mas and molar mass of butane:
To get ΔE rxn per mole of butane, we need to divide q rxn by the number of moles that actually reacted. This is the change in the internal energy of the reaction for that specific amount of butane that was burned. Since the reaction occurs under conditions of constant volume, q rxn = ΔE rxn, so we need to calculate the q cal using the following formula: This means, the heat goes from the reaction to the calorimeter and assuming there is no heat loss, the heat released by the reaction is equal to the heat absorbed by the calorimeter: Post memes/jokes in /r/chemistrymemes and /r/chemistryjokes.Because the combustion of butane increased the temperature of a bomb calorimeter, it is an exothermic reaction.
Any such posts will be deleted.Īsk education and jobs questions in the current weekly topic. If you're looking for a more concentrated, advanced discussion of chemistry topics among professionals and grad students, check out /r/Chempros.īefore asking "What chemical is this?" see this chart. Click here for the OSHA chemical data site and here for a multicompany MSDS aggregate search. If you spill/injure yourself contact medical professionals and read the MSDS, do not post to this reddit. Yes links to blogs, images, videos, comics, and infographics are okay especially if they are on your personal website. No physorg, sciencedaily, or other press release aggregator spam! If a caption or explanation is included this helps, but please use your discretion.īefore asking about chemical drawing/illustration programs, look at your school's IT/software website and see if they provide an institutional license of ChemDraw (hint: if they have a chemistry department, they will)
Likewise, simple pictures of uninteresting and garden variety chemistry-related things are not appreciated. No memes, rage comics, image macros, reaction gifs, or other "zero-content" material. However, academic discussions on pharmaceutical chemistry and the science of explosives are permitted. Rules: Violating a rule will result in a ban.Īsk homework, exam, lab, and other undergraduate-level questions at ChemicalForums otherwise it will be deleted.ĭiscussions on illicit drug synthesis, bomb making, and other illegal activities are not allowed and will lead to a ban.
0 kommentar(er)
