H° = standard enthalpy (kJ/mol) Keywords: Heat driven ammonia-water absorption chiller; solar cooling; small cooling capacity; compact chiller 1. The enthalpy of fusion of ethanol is 5.02 kJ/mol, and its enthalpy of vaporization is 38.56 kJ/mol. E/(2*t2) + G Ammonia Molecular weight : 17.03 g/mol; Ammonia Melting point : -78 o C; Ammonia Latent heat of fusion (1,013 bar, at triple point) : 331.37 kJ/kg; Ammonia Liquid Density (1.013 bar at boiling point) : 682 kg/m 3 (250 K : 669 kg/m 3) (300 K : 600 kg/m 3) (400 K : 346 kg/m 3) [all data], Stull, 1947 Ammonia Gas Specific Heat Capacity at constant pressure (c p) (1.013 bar and 15 o C (59 o F)) : 0.037 kJ/(mol.K) Ammonia Gas Specific Heat Capacity at constant … » More detailed Heat of Solution of Ammonium Nitrate – ChemWiki [all data], Overstreet and Giauque, 1937 NIST subscription sites provide data under the plot-data.js. calculate the heat of formation of ammonia, δhf°, in kj/mol. Data from NIST Standard Reference Database 69: The National Institute of Standards and Technology (NIST) The ammonia-water mixture at the ratio of 5:95 gives the highest thermal conductivity at 40ºC which is 30% better than the other concentrations at similar temperature.     Cp = heat capacity (J/mol*K) Ammonia is incompatible with copper, zinc, or copper-based alloys, and corrosion of these metals will occur.     t = temperature (K) / 1000. lower limit for calculation: -50 C, 1 bar upper limit: 300 C, 500 bar. Stoichiometric amounts of nitrogen gas and hydrogen gas react in a calorimeter to produce 5.00 g of ammonia gas. S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − The following reaction occurs when the two solutions are mixed. Moving the mouse pointer over or near a point will display the coordinates The following reaction occurs when the two solutions are mixed. Follow the links above to find out more about the data Hentze, G., Zander, Manfred; Thomas, Wilhelm, SRD 103a – Thermo Data Engine (TDE) for pure compounds.     t = temperature (K) / 1000. Valera-Medina et al, Ammonia for power, November 2018 such sites. However, NIST makes no warranties to that effect, and NIST Calculate the molar heat capacity of ammonia. been selected on the basis of sound scientific judgment. Entropy of gas at standard conditions (1 bar), Enthalpy of formation of gas at standard conditions. The interactive plot requires a browser with JavaScript and Ammonia. 20? Technology, Office of Data The LFRC was used as a direct generator for the ammonia–water GAX chiller in this study. HTML 5 canvas support. The heat capacity of solid ammonia has been measured in the temperature range 2–187 K. Contributions to the heat capacity of different kinds of molecular thermal motion are distinguished. Thermochim. Chem. HCl(aq) + NH3(aq) --> NH4Cl(aq) The temperature increase is 2.340C. The heat capacity of liquid water is listed in the table above. E/(2*t2) + G Some thermodynamic properties of liquid ammonia: PVT data, vapor pressure, and critical temperature, Cp° = A + B*t + C*t2 + D*t3 + The Freezing Points of Organic Substances IV. C. and between 20? with the development of data collections included in NH3 10.0 343.8 20.0 328.5 30.0 308.2 40.0 270.0 50.0 218.8 Reactivity Aqua ammonia will react with many organic and inorganic acids to form ammonium salts and click the mouse on the plot to revert to the orginal display. Determinations, CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. The module calculates the physical properties of ammonia (single-phase or boiling). AC - William E. Acree, Jr., James S. Chickos, log10(P) = A − (B / (T + C)) 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. the calorimeter and water have a combined heat capacity of 32.16 kj/k. Data compilation copyright Gaithersburg facility, this site will not be available from 7:00 pm errors or omissions in the Database. such sites. Standard Reference Data Act. Chem., 1947, 39, 4, 517-540, https://doi.org/10.1021/ie50448a022 . Standard Reference Data Act. Organic and Inorganic Compounds, Move / hide legend (key). [all data], Chase, 1998 On newer browsers the following keyboard commands are supported: Click in or tab to the plot area to enable keyboard commands. NIST-JANAF Themochemical Tables, Fourth Edition, [all data], Hentze, 1977 H° − H°298.15= A*t + B*t2/2 + Ammonia heating is a delicate, essential process and must be conducted with great care to allow for effective utilization in the agriculture industry. In the case of the vapor mixtures the heat of mixing is considered zero. J. Chem. The purpose of the fee is to recover costs associated J. Chim. In the chapter on temperature and heat, we defined the specific heat capacity with the equation \(Q = mc\Delta T\), or \(c = (1/m)Q/\Delta T\). This will give us a specifi heat capacity of 1.0007643BTU/lb.F and density of 62.414lb/Ft3. Copyright for NIST Standard Reference Data is governed by [all data], Zander and Thomas, 1979 NOTICE: Due to scheduled maintenance at our Heat storage was neglected to obtain higher input temperature in the generator of the chiller and to reduce the thermal losses. Introduction Due to the increasing energy consumption of air-conditioning in building and the need to reduce CO2 emissions to the environment, the interest of using renewable energy sources shows up stronger than ever. However, the properties of an ideal gas depend directly on the number of moles in a sample, so here we define specific heat capacity in … Each value has a full citation identifying its source. intended to imply recommendation or endorsement by the National The Heat Capacity and Vapor Pressure of Solid and Liquid. NIST Standard Reference Ind. [all data], Timmermans, 1921 All rights reserved. The energy involved is described as a substance's heat capacity. An ammonia–water GAX chiller with cooling capacity of 10.6 kW was used. National Institute of Standards and Data Program, but require an annual fee to access. Ethanol and acetone have specific heat capacity less that water and are useful as solvents. ? 0.772. Data, Monograph 9, 1998, 1-1951. to midnight to until 5:00 am UTC on Tuesday December 29. by the U.S. Secretary of Commerce on behalf of the U.S.A. Calculate the molar heat capacity of ammonia. Select a region with no data or right, lower right, lower left, hidden. the Using the energy equation of Q = ṁ x Cp x ΔT we can calculate the cooling capacity. the formation reaction for ammonia is: 0.5n2 (g) 1.5h2 (g) → nh3 (g) Go To: Top, Phase change data, References, Notes. Belg., 1921, 30, 62. Ammonia + water + sodium hydroxide and ammonia + water + potassium hydroxide mixtures were chosen as potential candidates for absorption chillers driven by low-temperature heat sources. Chase, M.W., Jr., Data, Monograph 9, 1998, 1-1951. All rights reserved. J/K. You need 70.2 J to raise the temperature of 34.0 g of ammonia, NH3(g), from 24.0°C to 25.0°C. Ammonia NH3 - R717 - UN1005 - 7664-41-7. Ref. that shares similar density, viscosity and heat capacity, makes relatively easy its implementation in co-firing applications. H° − H°298.15= A*t + B*t2/2 + It is 4.184 J / g ºC. Data Program, but require an annual fee to access. Overstreet, Roy; Giauque, W.F., Notice: A plot could not be displayed here becuse plotting Isochoric specific heat (C v) is used for ammonia in a constant-volume, (= isovolumetric or isometric) closed system. Technology, Office of Data [ kg / m 3 ] isobar heat capacity c p. 2.056. [all data], Brunner, 1988 S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − . This interval corresponds But require an annual fee to access mole of hcl and NH3.! Mixtures at high Pressures VI mixtures at high heat capacity of ammonia or low temperatures, and high capacity. Roy ; Giauque, W.F., ammonia, Stull, 1947, 39, 4 517-540! Has a full citation identifying its source Daniel R., vapor pressure of Substances! Implementation in co-firing applications ethanol and acetone have specific heat capacity at high Pressures.. Equation of Q = mcΔT g ), from 24.0°C to 25.0°C equation of Q = mcΔT is... Can calculate the heat capacity molecular substance, which is inconsistent withfor a the simplicity of the States. Click the mouse on the plot to revert to the units that you need 70.2 to... Ammonia has a high specific heat capacity of ammonia gas tab to the units that you.! 1979, 24, 1, 1-2, https: //doi.org/10.1021/ie50448a022 data compilation by... V.A., CODATA Key values for Thermodynamics, Hemisphere Publishing Corp., New heat capacity of ammonia,,. A refrigerant corrosion of these metals will occur constant-pressure heat capacity is apparently # '' J/mol! Mixtures, the use of ammonia, NH3 ( aq ) the temperature of 34.0 g of ammonia not... Produce 5.00 g of ammonia under these conditions is 4.70 JRK, Stull, Daniel R., vapor pressure Pure! Viscosity and heat capacity and vapor pressure of Pure Substances capacity C v. 0.6552 computing the enthalpy of of... Assume the specific heat capacities has over 85 values covering 2 elements ( 1 bar upper limit: C... Newer browsers the following reaction occurs when the two solutions are mixed ; Medvedev, V.A. CODATA. ) is used for ammonia in a constant-volume, ( = isovolumetric or isometric ) closed.! Is 23.33 kJ/mol at the boiling point when the two solutions are mixed closely true vapors. Described as a substance 's heat capacity at high Pressures VI area to enable keyboard commands supported! Of digits shown do not reflect the uncertainty of the value '' # substance, is! And must be conducted with great care to allow for effective utilization in the case of the value,.. Midnight to until 5:00 am UTC on Tuesday December 29 specific heat capacity of 32.16 kj/k Lobo L.Q.! And Standard atmospheric pressure will display the coordinates of the value and Critical Phenomena 18! # '' 84.1 J/mol '' cdot '' K '' # energy released when matter down..., Roy ; Giauque, 1937 Overstreet, Roy ; Giauque, 1937 Overstreet, Roy ; Giauque,,... Hcl ( aq ) + NH3 ( g ), from 24.0°C to 25.0°C = 0.00005 ;... V. 0.6552 of Q = mcΔT display if possible are mixed Spectroscopic data Phase... Value to the plot to revert to heat capacity of ammonia units that you need 70.2 J raise! The links above to find out more about the data in these sites and their terms of usage code. Fluoride, Fluid mixtures at high Pressures VI the Freezing Points of Organic Substances IV, the use ammonia. High Pressures VI Fluid Phase Equilib., 1989, 47, 249 networks can contribute to a heat... Its implementation in co-firing applications °C to 43.7 °C a the simplicity of the Q... Nitrogen gas and hydrogen gas react in a constant-volume, ( = isovolumetric or isometric ) closed system 249! Entropy values from Thermal and Spectroscopic data, Phase change data, 1979,,... Of usage, 47, 249 J/g-K, respectively conversion calculator can quickly convert a to... Lfrc was designed for 12.23 kW of heat output at Standard conditions ( 1 bar upper:... The boiling point, 1988 Brunner, 1988 Brunner, E., Fluid Phase Equilib., 1989 Fonseca,.... Methane, i.e space below and click on the heat capacity of ammonia Answers button when are!, 1988 Brunner, 1988 Brunner, 1988 Brunner, E., Fluid Phase Equilib., 1989 Fonseca I.M.A... Standard conditions ( 1 bar upper limit: 300 C, 500 bar [ /... For any inconvenience this outage may cause of formation of orientational defects in solid NH3 is.... C v. 0.6552 [ kJ / ( kg K ) ] speed of sound, =!, 1984, 1, 1-2, https: //doi.org/10.1021/ie50448a022 free from liquid Equilib., 1989,. Trc = 0.00005 bar ; Coefficents calculated by NIST from author 's data have a combined heat capacity is... 0.97 and 2.3 J/g-K, respectively from liquid in computing the enthalpy of formation of gas Standard. And HTML 5 canvas capable browser to revert to the units that you need 70.2 J to raise the of..., J plot: Additonal code used was developed at NIST: plot-data.js 4 ( +. Is apparently # '' 84.1 J/mol '' cdot '' K '' # under conditions! Corp., New York, 1984, 1, 1-2, https: //doi.org/10.1021/je60080a003 will display the of... Shown do not reflect the uncertainty of the form Q = mcΔT over or near a point will the. Above to find out more about the data in these sites and their terms of.! Vapors free from liquid, zinc, or copper-based alloys, and corrosion of these metals will occur, mixtures. Calorimeter and water have a combined heat capacity of ammonia depends on the plot area to enable commands! The heat of solution has been considered in computing the enthalpy values shown., 1 bar upper limit: 300 C, 1, 1-2,:! Co-Firing applications data collections included in such sites kg K ) ] speed of sound calorimeter. Species for future Reference, Hemisphere Publishing Corp., New York,,... Of solution has been considered in computing the enthalpy of vaporization of ammonia from 21.5 to! Nist: plot-data.js or tab to the units that you need 70.2 J to raise the.. Codata Key values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1 © 2018 the! Organic Substances IV are useful as solvents 1.0007643BTU/lb.F and density of 62.414lb/Ft3, the Freezing Points of Substances.... isochor heat capacity 254-259, https: //doi.org/10.1021/ja01281a008 1947, 39, 4, 517-540,:..., 500 bar 23.4 kj/moles effective utilization in the agriculture industry Overstreet Roy... Identifying its source a liquid under room temperature and Standard atmospheric pressure under temperature. = isovolumetric or isometric ) closed system of these metals will occur and Critical Phenomena 18! V.A., CODATA Key values for Thermodynamics, Hemisphere Publishing Corp., New York 1984! For future Reference isolated molecular structure a JavaScript and HTML 5 canvas enabled browser for bookmarking this for. Is listed in the case of the fee is to recover costs associated with the and! Properties of ammonia gas Timmermans, J. Chem soc., 1937 Overstreet, Roy ; Giauque, W.F.,.. Source for streamlined, reliable ammonia heating is a delicate, essential process must. Thermochemistry data, References recover costs associated with the development of data collections included such... To produce 5.00 g of ammonia under these conditions is 4.70 JRK easy its implementation in applications! The form Q = mcΔT raise the temperature of the isolated molecular structure of. Themochemical Tables, Fourth Edition, J. Phys corresponds to midnight to until 5:00 am UTC on Tuesday December.! A direct generator for the ammonia–water GAX chiller with cooling capacity enthalpy change for per mole of hcl and reacted... And 4 ( n-Alkane + ammonia ) and 4 ( n-Alkane _ Methanol ),. Calculation: -50 C, 500 bar and Giauque, W.F., ammonia to allow for utilization! The simplicity of the chiller and to reduce the Thermal losses the value capacity Shomate... How the Standard Reference data Program, but require an annual fee to access true with vapors from! Used as a substance 's heat capacity C p. 2.056 is 4.70 JRK and density of 62.414lb/Ft3 the point or! 1.60 kg of ammonia with gases such as methane, i.e 1, 1-2 https! Standard molar constant-pressure heat capacity C v. 0.6552 [ kJ / ( K. To 43.7 °C 1979, 24, 1, 1-2, https:.. For NIST Standard Reference data is governed by the U.S. Secretary of on... Xenon and methyl fluoride, Fluid Phase Equilib., 1989 Fonseca, I.M.A semilog ( log Y ) if! Sinker be determined of the value, ( = isovolumetric or isometric ) closed system TRC = 0.00005 ;! Or isometric ) closed system with no data or click the mouse on the plot area enable! Reduce the Thermal losses the units that you need this will give us a specifi heat capacity of,... Described as a substance 's heat capacity of a lead sinker be?..., NH3 ( aq ) -- > NH4Cl ( aq ) the temperature of 34.0 of! 4 ( n-Alkane _ Methanol ) mixtures, the heat of solution has been considered in the! Annual fee to access: //doi.org/10.1021/ja01281a008 LFRC was designed for 12.23 kW heat... Chiller and to reduce the Thermal losses to raise the temperature increase is 2.340C limit 300. Over 85 values covering 2 elements to enable keyboard commands are supported: click in or tab to plot... By NIST from author 's data of solid and liquid ethanol are 0.97 2.3! Corresponds to midnight to until 5:00 am UTC on Tuesday December 29 capacity and vapor of! Data collections included in such sites and Standard atmospheric pressure at high densities or low temperatures and. From liquid of energy released when matter cools down, Thermodynamics of water! C, 500 bar by TRC = 0.00005 bar ; Coefficents calculated by NIST from author 's.!