Chem. kilogram/cubic meter [kg/m3] = gram/liter [g/l], kilogram/liter [kg/l] = gram/cubic centimeter [g/cm3]= ton(metric)/cubic meter [t/m3], once/gallon(US liquid) [oz/gal(US liq)] pound/cubic inch [lb/in3], pound/cubic foot [lb/ft3], pound/gallon(UK) [lb/gal(UK)], pound/gallon(US liquid) [lb/gal(US liq)], slug/cubic foot [sl/ft3], ton(short)/cubic yard [ton(short)/yd3], ton(long)/cubic yard [yd3]. Benzene appears as a clear colorless liquid with a petroleum-like odor. National Institute of Standards and Technology; U.S. Department of Commerce; 100 Bureau Drive; Gaithersburg, MD 20899 USA. The vapor pressure of pure water is 47.1 torr at 37C.
The vapor pressure of pure water is 47.1 torr at 37C. The output density is given as kg/m3, lb/ft3, lb/gal(US liq) and sl/ft3. Where are the mud wrestlers from the movie stripes? Also, a positive association has been observed between . A compound is 77.26% C, 13.95% H, and 8.58% O by mass. v=15.0mL m=27.0g d=? C is 75 mm Hg and that of toluene at 20.0 C is 22 mm Hg. DH - Eugene S. Domalski and Elizabeth D. Hearing, log10(P) = A (B / (T + C)) [all data], Domalski and Hearing, 1996 What is the ratio between specific weight and mass density of a liquid? Zibberman-Granovskaya, A.A., This page provides supplementary chemical data on benzene.
PDF Colligative Property Problems - Colgate University We can solve vapor pressure problems in either of two ways: by using Equation 13.6.1 to calculate the actual vapor pressure above a solution of a nonvolatile solute, or by using Equation 13.6.4 to calculate the decrease in vapor pressure caused by a specified amount of a nonvolatile solute. B ( molar mass Note: (s) notation indicates equilibrium temperature of vapor over solid, otherwise value is equilibrium temperature of vapor over liquid. Question: The Density of benzene at 25 degrees Celsius is .879 g/cm3 . What temperature will benzene be both liquid and gas? It is mainly used as a precursor to heavy chemicals. Benzene evaporates into the air very quickly. Please read AddThis Privacy for more information. It cannot undergo conformational changes, because none of its C-C bonds can rotate. How much is a 1928 series b red seal five dollar bill worth? Is solid benzene more dense than liquid benzene at its melting point? Refer for medical attention . Was the final answer of the question wrong?
Benzene, chloro- - NIST Chemistry WebBook Soc., 1937, 59, 2726. Collect leaking and spilled liquid in sealable containers as far as possible. In this case your data may potentially be accessed by US Authorities for surveillance purposes and you may not be able to exercise effective legal remedies. Pain. An acidic material was derived from benzoin by sublimation, and named flowers of benzoin, or benzoic acid. Sore throat. How did the industrial revolution change working conditions for people? Proc. Transportation
answered 08/30/20, Energetic, Enthusiastic and Experienced PhD Chemistry Tutor. This refers to a system, substance or application that adheres to governmental regulations regarding volatile organic compounds. The Systems Benzene-n-Heptane, n-Hexane-Chlorobenzene, and cycloHexane-Nitrobenzene, Rinse mouth. Nov 18 2022 08:12 AM 1 Approved Answer Mark B answered on November 20, 2022 5 Ratings ( 12 Votes) d= m/v d = .879 g/cm3 = 0.879 kg/L. following TRC products: Stull, 1937 Boiling point: 80C Melting point: 6C Relative density (water = 1): 0.88 Solubility in water, g/100ml at 25C: 0.18 Vapour pressure, kPa at 20C: 10 Relative vapour density (air = 1): 2.7 Relative density of the vapour/air-mixture at 20C (air = 1): 1.2Flash point: -11C c.c.Auto-ignition temperature: 498C Explosive limits, vol% in air: 1.2-8.0Octanol/water partition coefficient as log Pow: 2.13. one year ago, Posted
AP Chemistry Chapter 13 Test Flashcards | Quizlet Last accessed: 29 August 2020 (cameochemicals.noaa.gov). The Weight of Falling Drops and Tate's Laws.
Take the mass density of benzene to be 0.8765 g cm3. Assuming that benzene, toluene solutions are ideal, then the equation for the density (e) of solution as: e = 1 0 0 1 [0. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! Abstract: We report a computer simulation study on the hydration of benzene, which, despite being hydrophobic, is a weak hydrogen bond acceptor. Melting Point (MP), Benzene changes its state from solid to liquid at 5.5C (41.9F or 278.65K) Boiling Point (BP), Benzene changes its state from liquid to gas at 80.1C (176.18F or 353.25K) Now you can substitute this mass of benzene and the density of benzene into the density equation to solve for the volume of benzene in mL. Boublik, T.; Fried, V.; Hala, E., The pressure of the solution is then calculated via Raoult's Law (Equation \(\ref{RLaw}\)): \[ P_{solution} = 0.99 \times 47.1 = 46.63 \, torr \nonumber\], Calculate the vapor pressure of a solution made by dissolving 50.0 g CaCl2, \(C_6H_{12}O_6\), in 500 g of water. 9.25 SATURATED VAPOR PRESSURE Temperature (degrees F) Pounds per square inch 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 210 0.881 1.171 1.535 1.989 2.547 3.227 4.049 5.033 6.201 7.577 9.187 11.060 13.220 15.700 18.520 21.740 25.360 9.26 . Wear face shield or eye protection in combination with breathing protection.
Further see Inhalation. SRD 103b Thermo Data Engine (TDE) for pure compounds, The Internal Heat of Vaporization constants of thirty pure substances, Inhalation risk
Therefore, Molecular mass of Benzene is 78 g/mol. (, Pharmaceutical instrument qualification service, Benzene, organic chemical compound, hydrocarbon, petrochemical, flammable liquid. MSDS for benzene is available at AMOCO. A bigger change that the glucose in Example \(\PageIndex{1A}\). At 25oC the vapor pressure of pure benzene is 93.9 torr. First, convert the moles of benzene to grams using the molar mass of benzene (look this up or calculate from the periodic table), which is 78.11 g/mol.
Do NOT use compressed air for filling, discharging, or handling. Refer for medical attention. If youve been exposed to benzene, the symptoms you experience will be dependent on the type of poisoning youve had. What is poor man and the rich man declamation about? Structure and properties. So, \[n_{water} = \dfrac{500\,g}{18\,g /mol} = 27.7 \,mol \nonumber\], \[n_{glucose} = \dfrac{50\,g}{180.2\,g /mol} = 0.277 \,mol \nonumber\], \[ \chi_{solvent} = \dfrac{ 27.7 \,mol}{ 0.277 \,mol + 27.7 \,mol } = 0.99 \nonumber\]. Specific weight is given as N/m3 and lbf/ ft3. [all data], Young, 1910
Pure Water Density Standard - MilliporeSigma Benzene is present in crude oils and is a product of oil-refining processes. Density of benzene vapor (singel phase) at varying temperature and given pressures, SI and Imperial units: Density and specific weight of benzene at given temperatures and pressures: For full table with Density and Specific Weight - rotate the screen! Only emails and answers are saved in our archive.
What is the density of benzene at 25 degrees celsius? I'm really confused on how to begin to begin the problem. To use Raoult's Law (Equation \(\ref{RLaw}\)), we need to calculate the mole fraction of water (the solvent) in this sugar-water solution.
13.6: Vapor Pressures of Solutions - Chemistry LibreTexts Its unit is k g m 3 \frac { { {\rm {kg}}}} { { { {\rm {m}}^3}}} m3kg. Benzene (IARC Monograph, Volume 120, 2018), Benzene (IARC Summary & Evaluation, Supplement7, 1987), Benzene (IARC Summary & Evaluation, Volume 7, 1974), Benzene (IARC Summary & Evaluation, Volume 29, 1982). View plot T = temperature (K).
Ethanol (data page) - Wikipedia Manage your online orders and purchase settings, Get full access to download all documents, Cookies from US-providers The density of benzene at 25.0 degrees C is .879g/cm3. Do NOT wash away into sewer.
Calculation of Mass - Physics Forums As a result of flow, agitation, etc., electrostatic charges can be generated. Routes of exposure
what is the volume of 0.950 mol of Benzene (C6H6) at 20.7C? The calculator below can be used to estimate the density and specific weight of liquid benzene at given temperature (maximum 250C or 620 F) and maximum 28 bara (400 psia).Note! [all data], Livingston, Morgan, et al., 1908 I'm really confused on how to begin to begin the problem. and chemical property data is available from the Density, , hasunits typically [kg/m3] or [lb/ft3], and is defined by the ratio of the mass to the volume of a substance: where m = mass, units typically [kg] or [lb] V = volume, units typically [m3] or [ft3]. Kristy L. 8 7 9 V + 0. 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, https://doi.org/10.1016/0045-6535(94)90445-6, https://doi.org/10.1007/978-94-009-3173-2.
Solved Calculate the effect of an increase in pressure of - Chegg Liquid-Vapour Equilibria. on behalf of the United States of America. NO open flames, NO sparks and NO smoking. Can we see pic of female inserting a tampon? View the full answer. of Liquids Using Drop Weights: II., Safety glasses. what is the density of the acid?
What is the volume of 0.950 mol of Benzene (C6H6) at 20.7C? Google use cookies for serving our ads and handling visitor statistics. Benzene is an organic chemical compound with the molecular formula C6H6 . Density of crude oil, Density of fuel oils, Density of lubricating oil and Density of jet fuel as function of temperature. Density of nitrogen at 25 degrees celsius: 1.2506 kg/m^3. Evacuate danger area!
Benzene - Density and Specific Weight vs. Temperature and Pressure 78 g/mol. Less dense than water and slightly soluble in water. (The bone marrow is where new blood cells are made.) Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. A, 1952, 5, 530. errors or omissions in the Database. [all data], Brown, 1952, 2 Structure and properties . How co2 is dissolve in cold drink and why? Surface tension: 28.88 dyn/cm at 25 C Viscosity: 0.7528 mPa . SRD 103a Thermo Data Engine (TDE) for pure compounds. UN Classification
Density The ratio between mass and volume of a liquid determines the density of a liquid. The density of Benzene at 15 degrees Celsius is [itex]0.8787 \frac{g}{mL}[/itex] Calculate the mass of 0.1500 L of Benzene at this temperature. It was formerly used as parasiticide. Temperature (K) A B C Reference Comment; 273.13 - 297.89: 4.23679: 1426.448-45.957: Besley and Bottomley, 1974: Coefficents calculated by NIST from author's data. AC - William E. Acree, Jr., James S. Chickos Density of benzene along the boiling and condensation curve, SI and Imperial units: The density of liquid benzene is nearly the same for all pressures up to 100 bara, and the density of the liquid at equilibrium pressure can be used for most practical purposes. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. High vapor pressure correlates with a low boiling point, which relates to the number of the samples molecules in the surrounding air, a trait known as volatility. ; Based on data from 333. There are limitations on the content of benzene in gasoline. When a non-volatile solvent is dissolved in benzene, the vapor pressure of benzene is lowered to 91.5 torr. J. Prevent build-up of electrostatic charges (e.g., by grounding).
APPENDIX A USEFUL TABLES AND CHARTS - Wiley Online Library What is the density of benzene at 25 degrees celsius? V= 84.4 mL (round answer to 3 significant figures because all of your given info has 3 significant figures), Hope this helps! Fresh air, rest. .
PDF WORKSHEET:SOLUTIONS AND COLLIGATIVE PROPERTIES SET A - Cerritos College It has a sweet odor and is highly flammable. (Hide this section if you want to rate later). Then store and dispose of according to local regulations. If this liquid is swallowed, aspiration into the lungs may result in chemical pneumonitis. What is the shape of C Indologenes bacteria? 2023 by the U.S. Secretary of Commerce Chem. Benzene boiling point at atmospheric pressure is 80 C (176F), and hence, benzene must be pressurized to remain liquid at higher temperatures than that. I love to write and share science related Stuff Here on my Website. for disposal with other flammable, non-chlorinated solvents. Data compilation copyright
7.2: Vapor Pressure - Chemistry LibreTexts Density of benzene is defined as the ratio of mass of benzene to that of its volume. [all data], Liu and Dickhut, 1994 Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Posted
Expert Answer. Benzene is less dense than water and is slightly soluble in water. Do not transport with food and feedstuffs.
At 25^oC benzene and toluene have densities 0.879 and 0.867 g - Toppr In case of fire: keep drums, etc., cool by spraying with water. It is highly recommended to seek the Material Safety Datasheet (MSDS) for this chemical from a reliable source such as SIRI, and follow its directions. The substance is irritating to the eyes, skin and respiratory tract. Volume concentration, %. Volatile organic compounds (VOC) are organic chemicals that have a high vapour pressure at room temperature. Because its molecules contain only carbon and hydrogen atoms, benzene is classed as a hydrocarbon. What is the concentration of the solute and the solvent, expressed in mole fraction? Young, S., The word benzene derives from gum benzoin (benzoin resin), an aromatic resin known to European pharmacists and perfumers since the 16th century as a product of southwest Asia. You can also withdraw your consent at a later time by accessing the Cookie Settings. Benzene is a chemical that is a colorless or light yellow liquid at room temperature. Mass fraction, %. Stull, D.R., It is dangerous to try to dispose of benzene by washing it down a sink, since it is toxic, will cause environmental damage, and presents a fire risk. Database of Hazardous Materials; NOAA Office of Response and Restoration. Benzene has been shown to cause chromosome changes in bone marrow cells in the lab. Vapor pressure lowering \(\Delta P= 2.4\; torr\) with \(\chi_{solute} = 0.026\). In your posted question you are given the amount (in moles) of benzene, the density of benzene (in g/mL) and the temperature. . Its vapor is heavier than air and may sink into low-lying areas. How is it possible for mantle rock to flow? [all data], Zibberman-Granovskaya, 1940 The vapour is heavier than air and may travel along the ground; distant ignition possible. Making educational experiences better for everyone. Chem., Stoechiom. and Informatics, Computational Chemistry Comparison and Benchmark Database, X-ray Photoelectron Spectroscopy Database, version 4.1, NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data). At 1.2 MPa the melting temperature changes to 429.26 K. Calculate the enthalpy and . COLOURLESS LIQUID WITH CHARACTERISTIC ODOUR. A 7.85 g sample of a compound with empirical formula C5H4 is dissolved in 301 g of benzene. Convulsions. The Density of benzene at 25 degrees Celsius is .879 g/cm3 . It is flexible and can undergo conformational changes. Submit your documents and get free Plagiarism report, (Rate this solution on a scale of 1-5 below). Flash point less than 0F.
Solubility Table of Compounds in Water at Temperature - MilliporeSigma . Attacks plastics and rubber. In addition to the Thermodynamics Research Center Benzene is an organic chemical compound with the molecular formula C 6 H 6 . Because of its structure, benzene is a very stable organic compound. of density and surface tension; Uncertainty assigned by TRC = 2. J. Sci. . Refer to the chart below to find reference values per gram of common compounds and salts (with chemical formula) at six temperatures of 100 g of water from 0 degrees to 100 degrees Celsius. Why did jeff dunham and paige get divorced? d=27.4g/15.0mL v=1.8g/mL May cause heritable genetic damage to human germ cells. Which type of chromosome region is identified by C-banding technique? Benzene should NOT be used at all unless no safer alternatives are available. The handling of this chemical may incur notable safety precautions. say that the density will still be ~0.88 g/mL at 25 degrees C. Density of (dry) air at 25 degrees celsius: 1.225 kg/m^3 Solubility in water, g/100ml at 25C: 0.18 Vapour pressure, kPa at 20C: 10 Relative vapour density (air = 1): 2.7 Relative density of the vapour/air-mixture at 20C (air = 1): 1.2 Flash point: -11C c.c. Stephenson, Richard M.; Malanowski, Stanislaw, K; calculation based on extrap. Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 Note that this still relatively dilute. Common examples of VOCs that may be present in our daily lives are: benzene, ethylene glycol, formaldehyde, methylene chloride, tetrachloroethylene, toluene, xylene, and 1,3-butadiene. Consult an expert! Remove all ignition sources. What specific section of the world do cannibals do not live? What is the volume in liters of 2.5 kg benzene? Use * as a wildcard character for partial matches, or enclose the search string in double quotes ("") for an exact match. Temperature is pretty much there to let you know you are at "room temperature" type conditions and density given does not need to be adjusted (as it would need to be for very high/low temperatures). solid benzene is 101.3 kPa at 80.1C . . Below is the simple approach. This information is used to improve the website. These applications will - due to browser restrictions - send data between your browser and our server. Table data obtained from CRC Handbook of Chemistry and Physics 44th ed. solid benzene is 101.3 kPa at 80.1C . Chemical dangers
Because it contains only carbon and hydrogen atoms, benzene is classed as a hydrocarbon.. Benzene is a natural constituent of petroleum and is one of the elementary petrochemicals. A Semi-micro Calorimeter for Measuring Heat Capacities at Low Temp., Its molecule is composed of 6 atoms joined in a ring, with 1 hydrogen atom attached to each carbon atom. Benzene belongs to a class of chemicals called volatile organic compounds, so called because they evaporate in the air. Further see Inhalation. Benzene C 6H 6 6.90565 1211.033 220.79 n-Butane C 4H 10 6.80897 935.86 238.73 n-Butanol C 4H 10O 7.838 1558.190 196.881 Carbon dioxide, solid CO 2(s) 9.81064 1347.788 272.99 Carbon dioxide, liquid CO 2(l) 7.5788 863.35 273.15 Carbon monoxide, CO 6.24021 230.272 260 Carbon tetrachloride CCl 4 6.9339 1242.43 230 Chlorine Cl 2 6.9317 859.17 246.14 .
ICSC 0015 - BENZENE - International Programme on Chemical Safety Reacts violently with oxidants, nitric acid, sulfuric acid and halogens. Highly flammable. Technology, Office of Data BS - Robert L. Brown and Stephen E. Stein Benzene Bromobenzene N-Butane Carbon disulphide Carbon dioxide Carbon tetrachloride Chloroform Di-ethyl ether Ethanol Ethyl acetate Ethyl formate N-Hexane n-Hexadecane . The content and density of the total solution at 20 degrees are also provided. The freezing point of the solution is 1.05 oC below that of the pure benzene. MAY BE ABSORBED! Assume that Raoult's law holds for each component of the solution, calculate the mole fraction of benzene in the vapor. How much should a 12 year old bench press? This table complements our Solubility Rules & Chart and Miscibility Table. Specific weight, , has units typically [N/m3] or [lbf/ft3] is defined by the ratio of the weight to the volume of a substance: where g = acceleration due to gravity, units typically [m/s2] and value on Earth usually given as 9.80665 [m/s2] or 32.17405 [ft/s2]. molality = T/Kf = 1.05 oC/(5.12 oC/m) = 0.205 m If both the normal melting point and the normal boiling point are above room temperature, the substance is a solid. Vapour/air mixtures are explosive. Formula: C6H6
Ref. Addition of 6.41 g of this compound to 1476.10 ml benzene, C6H6 ( density = 0.879g/m) lowers that freezing point from 5.53 degrees celsius to 4.1 degrees celsius. K. See also. What do the C cells of the thyroid secrete? For Free. Benzene is an organic chemical compound with the molecular formula C 6 H 6.The benzene molecule is composed of six carbon atoms joined in a planar ring with one hydrogen atom attached to each. The LibreTexts libraries arePowered by NICE CXone Expertand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of the Provost, the UC Davis Library, the California State University Affordable Learning Solutions Program, and Merlot. We don't save this data. A:, 1952, 5, 530-540. If you reject all cookies, only technically required cookies will be used. Store in an area without drain or sewer access. 0.8765 g/mL The density of benzene is 0.8765 g/mL. Dizziness. Legal. Absorb remaining liquid in sand or inert absorbent. What is the concentration of the solute and the solvent, expressed in mole fraction? Why is benzene a liquid at room temperature? Use ventilation, local exhaust or breathing protection. R. Dublin Soc., 1910, 12, 374. About FAQ Credits More documentation Benzene Formula:C6H6 Molecular weight:78.1118 IUPAC Standard InChI:InChI=1S/C6H6/c1-2-4-6-5-3-1/h1-6HCopy IUPAC Standard InChIKey:UHOVQNZJYSORNB-UHFFFAOYSA-NCopy CAS Registry Number:71-43-2 Chemical structure: This structure is also available as a 2d Mol fileor as a computed3d SD file The vapor pressure of pure benzene at 20. Use foam, water spray, carbon dioxide, powder. CAMEO Chemicals.
All rights reserved. Verwandtschaftsl., 1908, 64, 170. What is the density of benzene at 25 degrees Celsius?
(Solved) - The Density of benzene at 25 degrees Celsius is .879 g/cm 3 Use non-sparking handtools. 8 6 7 (1 0 0 V)] where V is the volume of benzene. reddens or appears damaged, call for medical aid. Saturation vapor pressures and thermodynamic properties of benzene and selected chlorinated benzenes at environmental temperatures,
Get a free answer to a quick problem. No packages or subscriptions, pay only for the time you need. Thus, 3600 kJ of heat are removed by the evaporation of 1.5 L of water. AddThis use cookies for handling links to social media. what is the molecular formula of this compound? Such changes are commonly found in human leukemia cells.
Density of Benzene in 285 units and reference information - Aqua-Calc [all data], Brown, 1952 Redness. Get plagiarism-free solution within 48 hours. Shortness of breath. Brown, I., The Density of benzene at 25 degrees Celsius is .879 g/cm 3 . The substance is toxic to aquatic organisms. Unconsciousness. ILO and WHO 2021. Chem. After being informed of potential risks for my data (including transfer to the USA and potential access by US authorities) in the Cookie Banner and Privacy Policy I accept the cookies from US-providers. See Chemical Dangers. Benzene is immiscible with water and will form the upper layer since it has a lower density of 0.879 g/cm3. The empirical formula of benzene is CH (its chemical formula is C6H6). I am currently continuing at SunAgri as an R&D engineer. Standard Reference Data Act. Copyright for NIST Standard Reference Data is governed by Transcribed image text: Calculate the effect of an increase in pressure of 100 bar on the vapor pressure of benzene at 25 degree C. which has density 0.879 g cm. To know more check the
[all data], Stull, 1937, 2 If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. Some of our calculators and applications let you save application data to your local computer. Sci. Because its molecules contain only carbon and hydrogen atoms, benzene is classed as a hydrocarbon. Homework Equations [itex]Density=\frac{mass}{volume}[/itex] The Attempt at a Solution The part of this problem that is throwing me off is the g/mL, and L measurements. Physical State; Appearance
Benzene - dynamic viscosity over temperature. It is denoted by , and its units can be gm/ cm3, Kg/ m3, Pounds/ cubic inch. A link to the app was sent to your phone. At 2 5 o C benzene and toluene have densities 0.879 and 0.867 g/mL respectively. What are the molar mass and molecular formula of this compound? Enthalpy of vaporization at standard conditions. What does it mean to call a minor party a spoiled? BENZENE BNZ 9.20 SATURATED LIQUID DENSITY Temperature (degrees F) Pounds per cubic foot . Vomiting. D=m/v d=0.879g/ml m=500.0g v=? Personal protection: complete protective clothing including self-contained breathing apparatus. Solution We start with the known volume of sweat (approximated as just water) and use the given information to convert to the amount of heat needed: 1.5L 1000g 1L 1mol 18g 43.46kJ 1mol = 3.6 103kJ. The triple point of benzene is at 5.5C and 4.8 kPa . E4B.5B The molar volume of a certain solid is 142.0 cm3 mol1 at 1.00 atm and 427.15 K, its melting temperature.
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