202007donli0journalOriginalDong, J.-X.[Jia-Xin]Li, Q.[Qiang]Tan, Z.-C.[Zhi-Cheng]Zhang, Z.-H.[Zhi-Heng]Liu, Y.[Yi]J. Chem. Thermodyn.20072007-02-01The standard molar enthalpy of formation, molar heat capacities, and thermal stability of anhydrous caffeineCaffeineStandard molar enthalpy of formationHeat capacityPhase transition39108-1141caffeineC8H10N4O21Commercial source199.93Density2carbon dioxideCO23nitrogenN24waterH2O5oxygenO211Principal objective of the workRDCTRC1/25/20071Triple point temperature, KDSC/DTACrystal 2Direct value, XCrystal 2Crystal 1Air at 1 atmosphere1413.39511Principal objective of the workRDCTRC1/25/20071Triple point temperature, KDSC/DTACrystal 1Direct value, XCrystal 1LiquidAir at 1 atmosphere1509511Principal objective of the workRDCTRC1/25/20071Molar enthalpy of transition or fusion, kJ/molDSC/DTACrystal 2Direct value, XAuthorStandard deviation of the meanCrystal 2Crystal 1Air at 1 atmosphere13.433.02411Principal objective of the workRDCTRC1/25/20071Molar enthalpy of transition or fusion, kJ/molDSC/DTACrystal 1Direct value, XAuthorStandard deviation of the meanCrystal 1LiquidAir at 1 atmosphere119.864.03411Principal objective of the workJCEJCE1/25/20071Molar heat capacity at constant pressure, J/K/molSmall (less than 1 g) adiabatic calorimetryCrystal 2Direct value, X1AuthorCrystal 2Pressure, kPa101.32561Temperature, K180.8265111.82451.05912184.1535112.26251.06131187.2215112.58351.062915190.1475112.78151.063905193.0475113.11251.06556195.9125113.49851.06749198.7285114.01551.0700751101.4936114.3251.07161104.2096114.60951.0730451106.8826114.91251.074561109.9816115.12751.0756351113.0316115.33351.0766651115.9626115.69351.0784651118.8126115.95651.079781121.5786116.21751.0810851124.2696116.44851.082241126.8866116.76151.0838051129.4346116.95551.0847751131.9176117.19551.0859751134.3376117.4351.087151136.6936117.55851.087791138.9946117.86451.089321141.2376118.03851.090191143.4236118.09751.0904851145.5246118.27951.0913951148.0046118.74251.093711150.0586118.88151.0944051152.0826118.98851.094941154.0836119.16951.0958451156.0576119.31751.0965851158.0146119.46251.097311159.9486119.5551.097751161.8676119.62151.0981051163.7686119.80251.099011165.7936119.83451.099171168.4656120.01351.1000651171.4116120.06551.1003251174.3216120.19451.100971177.2116120.33351.1016651180.0296120.39651.101981182.8026120.62751.1031351185.5716120.77151.1038551188.3036121.00451.105021191.0056121.20451.106021193.7086121.45451.107271196.3926121.56551.1078251199.0546121.69851.108491201.6986121.8451.10921204.3126122.00951.1100451206.9086122.22551.1111251209.4676122.38551.1119251212.0846122.49251.112461214.7566122.84851.114241217.4686122.99651.114981220.2016123.17451.115871222.9496123.35851.116791226.2656123.4651.11731230.0456123.73451.118671233.7596123.93351.1196651237.4336124.06651.120331241.0936124.30351.1215151244.6986124.36751.1218351248.2796124.43251.122161251.8216124.43651.122181255.3216124.54351.1227151258.7796124.74651.123731259.3916124.98351.1249151262.2486124.98951.1249451265.0696125.15251.125761267.8346125.3751.126851270.5836125.53151.1276551273.3126125.68551.1284251276.0356125.90151.1295051278.7616126.10551.1305251281.4896126.21851.131091284.2246126.46851.132341286.9246126.84751.1342351289.5796126.91151.1345551292.2296127.14451.135721294.8716127.23851.136191297.5166127.31651.136581300.1446127.32251.136611302.7486127.5451.13771305.3296127.69751.1384851307.9136127.74851.138741310.5096128.05651.140281313.0876128.17151.1408551315.6496128.21751.1410851318.1936128.29251.141461320.8576128.54951.1427451323.4236128.6651.14331325.9896128.73551.1436751328.6286128.8851.14441331.3116129.23451.146171333.9566129.47651.147381336.6136129.62451.148121339.2196129.85351.1492651341.7626129.98351.1499151344.2736130.25451.151271346.8276130.45351.1522651349.1796130.55451.152771351.6876130.69551.1534751354.3566130.90351.1545151357.0066131.11151.1555551359.6566131.33251.156661362.2716131.49451.157471364.8596131.61951.1580951367.4356131.87151.1593551369.9476132.02151.1601051372.4526132.04851.160241374.9066132.14451.160721377.3886132.40651.162031379.8416132.51351.1625651382.2846132.69551.1634751384.6956132.851.1641387.0786133.0651.165311-1Crystal 2208Gas302Gas405Gas5-9.5GasPrincipal objective of the workJCEJCE1/25/2007Combustion with oxygen1Molar internal energy of reaction at constant volume, kJ/molRotating bomb calorimetry298.155101.34AuthorStandard deviation of the meanCalibrated by the experimentalist1-4256.3262.156-1.77914472444303