where Cp is the molar heat capacity; a, b, and c, are constants; and T is the temperature in degrees Kelvin. : Diagram: A diagram is not needed for this problem. Chase, M.W., Jr., 2 . been selected on the basis of sound scientific judgment. The Freezing Points of Organic Substances IV. We have provided these links to other web sites because they may have information that would be of interest to you. Computational Chemistry Comparison and Benchmark DataBase Release 21 (August 2020) Standard Reference Database 101 National Institute of Standards and Technology Home All data for one species 1. to midnight to until 5:00 am UTC on Tuesday December 29. Ammonia was included in the present work to compare with measurements with the NIST vibrating-wire viscometer. Chern. Enthalpy of reaction ; Free energy of reaction ; IR spectra for over 16,000 compounds. Repeated presses of this key Read more NSRDS 20 Chem. Price: ... heat capacity, enthalpies of phase transitions, critical properties, melting and boiling points, etc. Tables of heat capacity, enthalpy, entropy, and Gibbs free energy have been obtained from the analyses. All rights reserved. All rights reserved. J. Phys. For measurements on water, several new 49. calorimeters were developed. Chemical, physical and thermal properties of Ammonia, NH 3: Values at 25oC /77oF / 298 K and 1 atm., if not other temperature and pressure given. New Exp. binary mixtures and chemical reactions, SRSD 2 – Web Thermo Tables (WTT), "lite" edition, SRSD 3 – Web Thermo Tables (WTT), professional edition, SRD 156 – Clathrate Hydrate Physical Property Database. Heat capacity c p: 47.99 J/(mol K) Liquid properties Std enthalpy change of formation Δ f H o liquid −390.76 kJ/mol Standard molar entropy S o liquid? AC - William E. Acree, Jr., James S. Chickos, log10(P) = A − (B / (T + C)) C*t3/3 + D*t4/4 − E/t + F − H Heat capacity c p: 47.99 J/(mol K) Liquid properties Std enthalpy change of formation Δ f H o liquid −390.76 kJ/mol Standard molar entropy S o liquid? Hentze, G., Heat capacity of anhydrous liquid ammonia. The list is probably 30 percent complete. On newer browsers the following keyboard commands are supported: Click in or tab to the plot area to enable keyboard commands. Stull, Daniel R., Zander, Manfred; Thomas, Wilhelm, Ref. NIST subscription sites provide data under the NIST webbook; bibliographic data; CCCBDB Experimental data. . Ref. intended to imply recommendation or endorsement by the National National Institute of Standards and Technology, Physical and Chemical Properties Division, 325 Broadway, Boulder, Colorado 80303 ... p molar isobaric heat capacity C¯ ... ammonia, the fundamental equation of state developed by When you scroll down a bit farther on the Results Page of the NIST Webbook, you will find the constants for the heat capacity polynomial for Ammonia shown in a table like this: C p o = A + B*t + C*t 2 + D*t 3 + E/t 2 H o - H o 298.15 = A*t + B*t 2 /2 + C*t 3 /3 + D*t 4 /4 - E/t + F - Δ f H o 298.15 S o = A*Ln(t) + B*t + C*t 2 /2 + D*t 3 /3 - E/(2*t 2) + G. Lesson 3C Blog. HTML 5 canvas support. and chemical property data is available from the Follow the links above to find out more about the data Ref. The following table of specific heat capacities gives the volumetric heat capacity, as well as the specific heat capacity of some substances and engineering materials, and (when applicable) the molar heat capacity.. Generally, the most constant parameter is notably the volumetric heat capacity (at least for solids), which is notably around the value of 3 megajoule per cubic meter and kelvin: Soc., 1937, 59, 2, 254-259, https://doi.org/10.1021/ja01281a008 We errors or omissions in the Database. Copyright for NIST Standard Reference Data is governed by with the development of data collections included in NOTICE: Due to scheduled maintenance at our : Read : The Shomate Equation will yield the most accurate estimate of the enthalpy change for an ideal gas. endorsement by the National Institute of Standards and Technology, USA, nor does it imply that the products are necessarily the best available for the purpose. Ammonia is an important commercial fluid which ranks among the top ten bulk chemicals in terms of large-scale production. Heat of Vaporization. Comparisons to available experimental data are given that establish the accuracy of calculated properties. NIST Links.     Cp = heat capacity (J/mol*K) Calculation of thermodynamic state variables of ammonia. Uncertainty assigned by TRC = 0.00005 bar; Coefficents calculated by NIST from author's data. However, the specific heat - C P and C V - will vary with temperature. Ammonium sulfate Other names: ammonium sulphate. right, lower right, lower left, hidden. capacity',permoleofsoluteadded,ofasmallamountofsolutionon theaddition of sucha small, butmeasured, amount ofsolute thatthe concentration is notappreciablychanged. kJ/(kg.K) 5.2092E-1 BTU/lb∙°F 2179.507 J/kg∙K 5.2092E-1 kcal/kg∙K. and Informatics, Vibrational and/or electronic energy levels, Electron-Impact Ionization Cross Sections (on physics web site), Computational Chemistry Comparison and Benchmark Database, X-ray Photoelectron Spectroscopy Database, version 4.1, NIST / TRC Web Thermo Tables, "lite" edition (thermophysical and thermochemical data), NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data). on behalf of the United States of America. [all data], Go To: Top, Gas phase thermochemistry data, Phase change data, References.     T = temperature (K). The ECS model extends the method to other types of molecules by the introduction of the “shape factors” θ and φ. Follow the links above to find out more about the data SRD 103b – Thermo Data Engine (TDE) for pure compounds, Ammonia Vapor pressure (at 21oC or 70oF) : 8.88 bar. Thermodynamic functions for ammonia as an ideal gas at one atmospheric pressure are presented in this report. Data Program, but require an annual fee to access. Owing to its large heat of vapor-J. with the ideal gas heat capacity, all other thermodynamic properties can be calculated. Bull. Δ c H° solid: Standard solid enthalpy of combustion (kJ/mol). Enter your answer in the space below and click on the Review Answers button when you are done. We have provided these links to other web sites because they may have information that would be of interest to you. BasG: Gas basicity (kJ/mol). NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data) Δ f G°: Standard Gibbs free energy of formation (kJ/mol). 4) The heat of vaporization of ammonia at its normal boiling point (-33.3°C) is +23.32 kJ/mol. Eng. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 ; Medvedev, V.A., Basis Set Exchange; Computational Chemistry List; Thermochemistry in Gaussian; Minnesota Database Collection; Benchmark Energy and Geometry; Point Groups. Data from NIST Standard Reference Database 69: The National Institute of Standards and Technology (NIST) Owing to its large heat of vapor-J. Technology, Office of Data shall not be liable for any damage that may result from Move / hide legend (key). There may be other web sites that are more appropriate for your purpose. click the mouse on the plot to revert to the orginal display. J/(mol K) Heat capacity c p? Data, Vol. Technology, Office of Data Thermodynamics of liquid mixtures of xenon and methyl fluoride, ; Wagman, D.D. 2.1645 . External links. kJ/(kg.K) 5.1773E-1 BTU/lb∙°F 2166.177 J/kg∙K 5.1773E-1 kcal/kg∙K. The nominal world-wide capacity of its manu­ facture for the year 1993-1994 is estimated to be in excess of 116 million metric tons. Your institution may already be a subscriber. and Informatics, Gas Phase Heat Capacity (Shomate Equation), Vibrational and/or electronic energy levels, Electron-Impact Ionization Cross Sections (on physics web site), Computational Chemistry Comparison and Benchmark Database, X-ray Photoelectron Spectroscopy Database, version 4.1, NIST / TRC Web Thermo Tables, "lite" edition (thermophysical and thermochemical data), NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data). NIST/TRC Web Thermo Tables (WTT) NIST Standard Reference Subscription Database 3 - Professional Edition Version 2-2012-1-Pro This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics.     Cp = heat capacity (J/mol*K) Data Program, but require an annual fee to access. The literature data examined thus far are listed in the following section. Data, Monograph 9, 1998, 1-1951. NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data) Heat capacity at constant volume Cv. It is 4.184 J / g ºC. The Entropy Values from Thermal and Spectroscopic Data, [all data], Stull, 1947 in these sites and their terms of usage. in these sites and their terms of usage. NIST webbook; bibliographic data; CCCBDB Experimental data. Δ sub H°: Enthalpy of sublimation at standard conditions (kJ/mol). Organic and Inorganic Compounds, The purpose of the fee is to recover costs associated been selected on the basis of sound scientific judgment. All rights reserved. Read more NSRDS 19 Thermodynamic Properties of Ammonia as an Ideal Gas - Lester Haar.     S° = standard entropy (J/mol*K) [all data], Chase, 1998 The heat capacity of liquid ammonia over a temperature range between 50 °F and 80 °F is given by the following expression: Cp = 0.487 + 2.39 x 10-4T Btu Where Cp is in and T is in F. Ibm "F a) What is the value of Cp at 80 °F. Standard Reference Data Act. Heat capacity at saturation pressure (Crystal 1 in equilibrium with Gas) as a function of Temperature Temperature from 223.37 K to 320.177 K 35 experimental data points ICR0443 International Congress of Refrigeration 2003, Washington, D.C. 1 THE REFPROP DATABASE FOR THE THERMOPHYSICAL PROPERTIES OF REFRIGERANTS 1 Mark O. McLinden 2, Eric W. Lemmon, and Marcia L. Huber Physical and Chemical Properties Division, National Institute of Standards and Technology Go To: Top, Phase change data, References, Notes. NIST's Office of Data and Informatics is a premier, pioneering resource for researchers and institutions in the physical sciences with domain expertise in biological, chemical, and materials sciences, specializing in large and information-rich data sets now common in many disciplines. C*t3/3 + D*t4/4 − E/t + F − H H° − H°298.15= A*t + B*t2/2 + All rights reserved. This interval corresponds Unusually high electrical conductivities of R32 samples were experienced in the NIST torsional-crystal viscometers and By selecting the following links, you may be leaving NIST webspace. Chem. [all data], Overstreet and Giauque, 1937 Read more NSRDS 20 Magnetic fields in vibrating-wire instruments have strengths of 1 T [14]. Toggle semilog (log Y) display if possible. Integrated heat Capacity; Calculating Enthalpy. Data, Monograph 9, 1998, 1-1951.     H° = standard enthalpy (kJ/mol) National Institute of Standards and NSRDS-NBS 19, 10p. We Ref. such sites. Heat capacity at saturation pressure (Liquid in equilibrium with Gas) as a function of Temperature Temperature from 195.495 K to 405.3 K 43 experimental data points Use or mention of technologies or programs in this web site is not However, NIST makes no warranties to that effect, and NIST The number of digits shown do not reflect the uncertainty of Chim. by the U.S. Secretary of Commerce on behalf of the U.S.A. Copyright for NIST Standard Reference Data is governed by     P = vapor pressure (bar) LATENTHEATOFVAPORIZATIONOFAMMONIA ByNathanS.OsborneandMiltonS.VanDusen CONTENTS Page I.Introduction. [all data], Fonseca and Lobo, 1989 J. such sites. Data, Vol. [all data], Hentze, 1977 Ammonia. NIST Standard Reference Simple corresponding states was developed for spherically symmetric molecules. Ammonia is a colourless gas with a characteristic pungent smell and hazardous in its concentrated form.. Chemical, physical and thermal properties of Ammonia, NH 3: Values at 25 o C /77 o F / 298 K and 1 atm., if not other temperature and pressure given. © 2018 by the U.S. Secretary of Commerce 2. The literature data [all data], Zander and Thomas, 1979 Moving the mouse pointer over or near a point will display the coordinates 2.1795 . The heat capacity of liquid water is listed in the table above.     S° = standard entropy (J/mol*K) However, NIST makes no warranties to that effect, and NIST     t = temperature (K) / 1000. Cox, J.D. Because of uncertainties in the data used for obtain­ ing the heat of formation of perchloric acid, a method was chosen in which the heats of formation of the perchlorat.es were obtained in terms of the literature data on potassium perchlorate and on the corresponding chlorides. Cp° = A + B*t + C*t2 + D*t3 + Brunner, E., [all data], Timmermans, 1921 Links. 2.1662 . NIST Webbook; Crippen Method; PAff: Proton affinity (kJ/mol). NIST Links. Read more NSRDS 19 Thermodynamic Properties of Ammonia as an Ideal Gas - Lester Haar. Requires a JavaScript / HTML 5 canvas capable browser. Database and to verify that the data contained therein have How much heat is required to raise the temperature of the object with the mass and heat capacity you entered? Ammonia is an important commercial fluid which ranks among the top ten bulk chemicals in terms of large-scale production. ; Lobo, L.Q., Ammonia Critical point - Critical temperature : 132.4oC - Critical pressure : 112.8 bar. E/(2*t2) + G kJ/(kg.K) 5.1732E-1 BTU/lb∙°F 2164.474 J/kg∙K 5.1732E-1 kcal/kg∙K. Enthalpy Change of Ammonia Using the IG Heat Capacity: 5 pts: Determine the enthalpy change and internal energy change of ammonia in J/mole, as it is heated from 350 K to 600 K, using the ideal gas heat capacity given by the Shomate Equation. ; Isochoric specific heat (C v) is used for ammonia in a constant-volume, (= isovolumetric or isometric) closed system. NOTICE: Due to scheduled maintenance at our UV/Vis spectra for over 1600 compounds. Fluid Mixtures at High Pressures VI. (1968). Am. NIST Standard Reference Tables of heat capacity, enthalpy, entropy, and Gibbs free energy have been obtained from the analyses. the Δ f H° gas: Enthalpy of formation at standard conditions (kJ/mol). Uses polynomial obtained from CHERIC. Data from NIST Standard Reference Database 69: The National Institute of Standards and Technology (NIST) An ammonia phase diagram are included. Basis Set Exchange; Computational Chemistry List; Thermochemistry in Gaussian; Minnesota Database Collection; Benchmark Energy and Geometry; Point Groups. C p = heat capacity (J/mol*K) H° = standard enthalpy (kJ/mol) ... Coefficents calculated by NIST from author's data. Thermochemistry. the J. Phys. The properties tabulated are pressure (P), density (ρ), enthalpy (H), entropy (S), isochoric heat capacity (Cv), isobaric heat capacity (Cp), speed of sound (u), viscosity (η), thermal conductivity (λ), and static dielectric constant (D). At ambient pressure and temperature the isobaric specific heat, C P, of ammonia is 2.2 [kJ/kg K] or 0.52 [Btu/lb °F] = [cal/g K], while the isochoric specific heat, C V, is 1.6 [kJ/kg K] or 0.39 [Btu/lb °F] = [cal/g K]. of the point. Ammonia Latent heat of vaporization ( 1.013 bar at boiling point) : 1371.2 kJ/kg. They chose this model because of its capability to predict properties of $water1ammonia% up to 20 MPa and 650 K, where experimental data are scarce for the VLE and virtually nonexistent for other properties. by the U.S. Secretary of Commerce on behalf of the U.S.A. Data, 1979, 24, 1, 1-2, https://doi.org/10.1021/je60080a003 The following components were used in generating the plot: Additonal code used was developed at NIST: Belg., 1921, 30, 62. One of these, constructed from copper and used for the region below 100 C, has been preserved in the NIST museum; it is shown in Fig. to midnight to until 5:00 am UTC on Tuesday December 29. NIST Webbook; Crippen Method; C p,gas: Ideal gas heat capacity (J/mol×K). Integrated heat Capacity; Calculating Enthalpy. NSRDS-NBS 19, 10p. Heat capacity at constant pressure Cp. Go To: Top, Gas phase thermochemistry data, References, Notes, Data compiled as indicated in comments: S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G The region of most industrial importance, however, ... the enthalpy and heat capacity of the liquid. Enthalpy of sublimation. Thermodyn., 1988, 20, 273. . There may be other web sites that are more appropriate for your purpose. (1968). Thermochim. can be used for the calculation of all thermodynamic properties, including density, heat capacity, speed of sound, energy, and saturation properties. Timmermans, J., Ammonia gas is heated from 325 K to 750 K.Using the ideal gas heat capacity given by the Shomate Equation, calculate the ΔU and ΔH in J/mole. Given : T 1: 350: K: T 2: 600: K: Find : ΔH 1-2 =??? SRD 103a – Thermo Data Engine (TDE) for pure compounds. S Prot: Protonation entropy at 298K (J/mol×K). Δ fus H°: Enthalpy of fusion at standard conditions (kJ/mol). ... Heat-Capacity Data on GHNOPS Compounds . NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data) [all data], Brunner, 1988 Fonseca, I.M.A. 239.6 - 371.5: 4.86886: 1113.928-10.409 : Stull, 1947: Coefficents calculated by NIST from author's data. The interactive plot requires a browser with JavaScript and By selecting the following links, you may be leaving NIST webspace. TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Kenneth Kroenlein director External links. with the development of data collections included in uses its best efforts to deliver a high quality copy of the C p,solid: Solid phase heat capacity (J/mol×K). … Δ sub H (kJ/mol) Temperature (K) Reference Comment; 31.2: 177. Data compilation copyright Ammonia is a colourless gas with a characteristic pungent smell and hazardous in its concentrated form. apologize for any inconvenience this outage may cause. NIST/TRC Web Thermo Tables (WTT) NIST Standard Reference Subscription Database 3 - Professional Edition Version 2-2012-1-Pro This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. . [all data], Go To: Top, Gas Phase Heat Capacity (Shomate Equation), References. . Enthalpy of formation (Hfg), Entropy, Integrated heat capacity (0 K to 298.15 K) (HH), Heat Capacity (Cp) plot-data.js. Select a region with data to zoom. Determinations, The following table of specific heat capacities gives the volumetric heat capacity, as well as the specific heat capacity of some substances and engineering materials, and (when applicable) the molar heat capacity.. Generally, the most constant parameter is notably the volumetric heat capacity (at least for solids), which is notably around the value of 3 megajoule per cubic meter and kelvin: Thermochemistry. J. Chem. . Some thermodynamic properties of liquid ammonia: PVT data, vapor pressure, and critical temperature, H° − H°298.15= A*t + B*t2/2 + following TRC products: Go To: Top, Gas phase thermochemistry data, Phase change data, Notes, Cox, Wagman, et al., 1984 … Gas chromatography data for over 27,000 compounds. The purpose of the fee is to recover costs associated . Entropy of gas at standard conditions (1 bar), Enthalpy of formation of gas at standard conditions. Ammonia - Specific Heat at varying Temperature and Pressure - Online calculator, figures and tables showing specific heat, C P and C V, of gasous and liquid ammonia at temperatures ranging from -73 to 425°C (-100 to 800°F) at pressure ranging from 1 to 100 bara (14.5 - 1450 psia) - SI and Imperial Units This interval corresponds errors or omissions in the Database. until midnight EST on Monday December 28. Phys. Eng. In addition to the Thermodynamics Research Center will posiiton the legend in the following sequence: upper left, upper uses its best efforts to deliver a high quality copy of the shall not be liable for any damage that may result from View plot Specific heat (C) is the amount of heat required to change the temperature of a mass unit of a substance by one degree.. Isobaric specific heat (C p) is used for ammonia in a constant pressure (ΔP = 0) system. apologize for any inconvenience this outage may cause. J/(mol K) Heat capacity c p? Director of the National Institute of Standards and Technology (NIST) on October 9, 2015. Literature Survey of Heat-Capacity, Enthalpy, ... A systematic compilation of a bibliography on heat-capacity data of ammonia, carbon dioxide, and water is being made. NIST-JANAF Themochemical Tables, Fourth Edition, All extensive properties are given on a mass basis. Vapor Pressure of Pure Substances. Ammonia, with its four atoms, is an incredibly simple molecule: Despite this simplicity, its large-scale industrial production from its constituent elements — nitrogen and hydrogen — was, and remains, a great scientific challenge. Gaithersburg facility, this site will not be available from 7:00 pm National Institute of Standards and © 2018 by the U.S. Secretary of Commerce Soc. the value. NIST subscription sites provide data under the A systematic compilation of a bibliography on heat-capacity data of ammonia, carbon dioxide, and water is being made. No inferences should be drawn on account of other sites being referenced, or not, from this page. Select a region with no data or The nominal world-wide capacity of its manu­ facture for the year 1993-1994 is estimated to be in excess of 116 million metric tons. Critical temperature measurement of liquids by means of differential thermal analysis, Chase, M.W., Jr., Table 3 shows the specific heat capacity of solids as a function of temperature, the specific heat capacity of liquids at the melt-ing point (T m), and the enthalpy of fusion for most common elements found in cast metals. ammonia. Your institution may already be a subscriber. until midnight EST on Monday December 28. Chern. Ammonia Gas Density ( 1.013 bar at boiling point) : 0.86 kg/m3. CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. Phase Separation and Critical Phenomena in 18 (n-Alkane + Ammonia) and 4 (n-Alkane _ Methanol) Mixtures, for intercomparing the heats of formation of lithium, ammonium, sodium, and potassium percillorates. C p,gas: Ideal gas heat capacity (J/mol×K). - 195. If values are given for liquid ammonia at ambient temperature, the ammonia is pressurized above 1 atm. Chem. Go To: Top, Gas Phase Heat Capacity (Shomate Equation), Notes, Chase, 1998 InChI: InChI=1S/H8N2O4S/c1-5-7(3,4)6-2/h1-2H4 InChI Key: KTMPTTWZBSFVPI-UHFFFAOYSA-N Formula: H8N2O4S Thermodynamic functions for ammonia as an ideal gas at one atmospheric pressure are presented in this report. Phys.     t = temperature (K) / 1000. These shape factors are fitted to experimental data. Ind. 24, No.5, 1995 Overstreet, Roy; Giauque, W.F., Review of low-GWP refrigerant pool boiling heat transfer on enhanced surfaces Lingnan Lin⇑, Mark A. Kedzierski National Institute of Standards and Technology, Gaithersburg, MD 20899, USA article info Article history: Received 25 July 2018 Received in revised form 27 November 2018 Accepted 27 November 2018 Keywords: Low-GWP refrigerants Pool boiling Heat transfer Enhanced surfaces … Database and to verify that the data contained therein have Institute of Standards and Technology, nor is it intended to imply NIST-JANAF Themochemical Tables, Fourth Edition, (TRC) data available from this site, much more physical Standard Reference Data Act. 1.6421 . NIST/TRC Web Thermo Tables (WTT) NIST Standard Reference Subscription Database 3 - Professional Edition Version 2-2012-1-Pro This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. . Fluid Phase Equilib., 1989, 47, 249. Hydrogen gas is readily available from fossil fuels, or from electrolysis of water. on behalf of the United States of America. E/t2     H° = standard enthalpy (kJ/mol) The Heat Capacity and Vapor Pressure of Solid and Liquid. J. Chem. Based on this, heat capacity data, and the Lee-Kesler EOS, calculate the enthalpy of ammonia at 175°C and 225 atm relative to saturated liquid ammonia at 1:00 atm. NIST ThermoData Engine Version 10.1 - Pure Compounds. No inferences should be drawn on account of other sites being referenced, or not, from this page. S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − Ammonia - Specific Heat at varying Temperature and Pressure - Online calculator, figures and tables showing specific heat, C P and C V, of gasous and liquid ammonia at temperatures ranging from -73 to 425°C (-100 to 800°F) at pressure ranging from 1 to 100 bara (14.5 - 1450 psia) - SI and Imperial Units