These applications will - due to browser restrictions - send data between your browser and our server. Temperature and Pressure - Online calculator, figures and table showing density and specific weight of pentane, C 5 H 12, at temperatures ranging from -130 to 325 C (-200 to 620 F) at atmospheric and higher pressure - Given: identity of solute, percentage by mass, and vapor pressure of pure solvent. WebPentane Formula:C5H12 Molecular weight:72.1488 IUPAC Standard InChI:InChI=1S/C5H12/c1-3-5-4-2/h3-5H2,1-2H3Copy IUPAC Standard InChIKey:OFBQJSOFQDEBGM-UHFFFAOYSA-NCopy CAS Registry Number:109-66-0 Chemical structure: This structure is also available as a 2d Mol fileor as a computed3d SD file The 3d structure may be viewed using Javaor See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure, as well as Thermophysical properties of: Acetone, Acetylene, Air, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Propane, Toluene, Water and Heavy water, D2O. so who do I turn to, but wikiHow? Find out the new pressure at which water will boil. We can view the system as having two competing equilibria: water vapor will condense in both beakers at the same rate, but water molecules will evaporate more slowly from the glucose solution because fewer water molecules are at the surface. %%EOF Pentanes are components of some fuels and are employed as specialty solvents in the laboratory. For example, let's say that we're told that we have a container full of liquid at 295 K whose vapor pressure is 1 atmosphere (atm). 0000001201 00000 n PROBLEM SETUP. Ideal solutions and ideal gases are both simple models that ignore intermolecular interactions. Science. Light molecules, those with high kinetic energy or those with weak intermolecular forces, have higher vapor pressures, and therefore a higher volatility - the tendency to vaporize. Hence the AB interactions will be weaker than the AA and BB interactions, leading to a higher vapor pressure than predicted by Raoults law (a positive deviation). We can use the Omnicalculator tool Vapor pressure calculator or the Clausius Clapeyron equation as follows: Define a boiling temperature and pressure you know. Given: identity of solute, percentage by mass, and vapor pressure of pure solvent. Both the liquid an the vapor are flammable. For each system, compare the intermolecular interactions in the pure liquids with those in the solution to decide whether the vapor pressure will be greater than that predicted by Raoults law (positive deviation), approximately equal to that predicted by Raoults law (an ideal solution), or less than the pressure predicted by Raoults law (negative deviation): positive deviation (vapor pressure greater than predicted), negative deviation (vapor pressure less than predicted). This may seem like a small amount, but it constitutes about a 2% decrease in the vapor pressure of water and accounts in part for the higher humidity in the north-central United States near the Great Lakes, which are freshwater lakes. WebThe emission rate of n-pentane from the tailpipes of diesel powered trucks was measured as 1,860 mg/km (6). The favorable AB interactions effectively stabilize the solution compared with the vapor. Some of our calculators and applications let you save application data to your local computer. Systems stabilized by hydrogen bonding between two molecules, such as acetone and ethanol, exhibit negative deviations from Raoults law. WebPropane - Density and Specific Weight vs. In this case, we calculate the vapor pressure of each component separately. Equations \ref{13.6.6} and \ref{13.6.7} are both in the form of the equation for a straight line: \(y = mx + b\), where \(b = 0\). Thanks for all that you do! Uses formula: log e P m m H g = {\displaystyle \scriptstyle \log _{e}P_{mmHg}=} log e ( 760 101.325 ) 10.41840 log e ( T + 273.15 ) 5778.024 T + 273.15 + 81.92460 + 1.178208 10 5 ( T + 273.15 ) 2 {\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-10.41840\log _{e}(T+273. endobj Chemistry questions and answers. For many years, researchers, industrials and students spent a lot of time searching the information they needed on the molecules used in their plants and laboratories, in many publications. Weblog 10 of n-Pentane vapor pressure. For information on how to find the vapor pressure of dissolved solutions, read on! MATHESON TRI-GAS, INC. MSDS from SDSdata.org index, "Viscosity and Surface Tension of Saturated n-Pentane", https://en.wikipedia.org/w/index.php?title=Pentane_(data_page)&oldid=1128617320, Creative Commons Attribution-ShareAlike License 3.0, Except where noted otherwise, data relate to, This page was last edited on 21 December 2022, at 02:11. If the system consisted of only a beaker of water inside a sealed container, equilibrium between the liquid and vapor would be achieved rather rapidly, and the amount of liquid water in the beaker would remain constant. Resolve the vapor pressure equation considering the 2nd point pressure is 0.6 atm. WebVAPORPRESSUREOFHYDROCARBONSFROM0.001TO10mmHg OA TicknerandLossing ' havemeasuredthevaporpressureof elevenhydrocarbonsandCO?asafunctionoftemperaturedownto apressureof0.001mmHgusingamassspectrometer.These Temperature and Pressure - Online calculator, figures and tables showing density and specific weight of propane, C 3 H 8, at temperatures ranging from -187 to 725 C (-305 to 1300 F) at atmospheric and higher pressure - WebVAPORPRESSUREOFHYDROCARBONSFROM0.001TO10mmHg OA TicknerandLossing ' havemeasuredthevaporpressureof elevenhydrocarbonsandCO?asafunctionoftemperaturedownto apressureof0.001mmHgusingamassspectrometer.These However, if heated above36C/97F it becomes a gas, and when cooled it becomes a solid. It also shows the saturation pressure with changes in temperature. The algorithm uses Let's say 100C, at 101.3kPa of atmospheric pressure. Asked for: vapor pressure of solution. If you have - keep reading. 1/ T3 = 0.0014888. stream Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. It is a component of some fuels and is employed as a specialty solvent in the laboratory. 124 0 obj The total vapor pressure of the solution (\(P_T\)) is the sum of the vapor pressures of the components: \[ \begin{align} P_T &=P_A+P_B \\[4pt] &=X_AP^0_A+X_BP^0_B \label{13.6.4} \end{align}\]. The net effect is to shift the dynamic equilibrium between water in the vapor and the liquid phases, decreasing the vapor pressure of the solution compared with the vapor pressure of the pure solvent. I know they've always helped me, even with the hardest of problems. Chemistry. Hint, air pressure at 3500 m.a.s.l., at 20C is 65kPa. Raoult's law is only accurate for ideal solutions. Thanks to all authors for creating a page that has been read 566,161 times. 128 0 obj In an aqueous solution of glucose, a portion of the surface area is occupied by nonvolatile glucose molecules rather than by volatile water molecules. xb```Vn>20pLp`QY0Qha(}c|,:K@'v2` Permanent linkfor this species. 0000010637 00000 n 132 0 obj trailer For example, water boils at 100 C when pressure is 1atm. Methanol contains an extensive hydrogen bonding network, but in this case the polar acetone molecules create AB interactions that are stronger than the AA or BB interactions, leading to a negative enthalpy of solution and a lower vapor pressure than predicted by Raoults law (a negative deviation). 0000010131 00000 n MORE Evaporation/Subl. 0000007685 00000 n Other names:n-Pentane;Skellysolve A;n-C5H12;Pentan;Pentanen;Pentani;Amyl hydride;NSC 72415. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Saturation Temperature. <>/ProcSet[/PDF /Text /ImageB /ImageC /ImageI]/Font<>>>/MediaBox[0 0 523 721]/Contents[128 0 R]>> The pressure lowering of the water is PX' as P stands for the pressure of pure solvent and X' is the molar fraction of the solute. Mixtures of benzene and toluene approximate an ideal solution because the intermolecular forces in the two pure liquids are almost identical in both kind and magnitude. Diversified CPC International, a Sumitomo Corporation of Americas Portfolio Company, is the global leader in the design, production, and distribution of the highest quality aerosol propellants, high-purity hydrocarbon refrigerants, and specialty applications. m (Volume) Vapor pressure: 4.649E-1 bar: Vapor pressure: 6.84E-1 bar: Applications. We also acknowledge previous National Science Foundation support under grant numbers 1246120, 1525057, and 1413739. Vapor pressure is directly related to the kinetic energy of a molecule. Uses formula: log e P m m H g = {\displaystyle \scriptstyle \log _{e}P_{mmHg}=} log e ( 760 101.325 ) 10.41840 log e ( T + 273.15 ) 5778.024 T + 273.15 + 81.92460 + 1.178208 10 5 ( T + 273.15 ) 2 {\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-10.41840\log _{e}(T+273. 0000002986 00000 n Chemistry questions and answers. startxref 0000026810 00000 n Calculate the vapor pressure of an aqueous solution containing 30.2% ethylene glycol by mass, a concentration commonly used in climates that do not get extremely cold in winter. Method 1 Using the Clausius-Clapeyron Equation 1 Write the Clausius-Clapeyron equation. 0000001969 00000 n To find the vapor pressure at a given temperature, use the Clausius-Clapeyron equation: ln(P1/P2) = (Hvap/R)((1/T2) - (1/T1)). 0000008248 00000 n Strategy: The phase diagram for pentane shows the phase behavior with changes in temperature and pressure. For each system, compare the intermolecular interactions in the pure liquids and in the solution to decide whether the vapor pressure will be greater than that predicted by Raoults law (positive deviation), approximately equal to that predicted by Raoults law (an ideal solution), or less than the pressure predicted by Raoults law (negative deviation). Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. PROCESS DATA. endobj Like an ideal gas, an ideal solution is a hypothetical system whose properties can be described in terms of a simple model. <> The vapour pressure of n - pentane = 420 mm of Hg and n - heptane = 36 mm of Hg . At an ambient pressure of 25 degrees Celsius, the vapor pressure of water is 23.8 torr. Hence the predominant intermolecular forces in both liquids are London dispersion forces. Strategy: Accuracy: For many substances, vapor pressures are only poorly known; expect errors up to a few 10% of the vapor pressure value and up to approx. Hexane and isooctane are both nonpolar molecules (isooctane actually has a very small dipole moment, but it is so small that it can be ignored). Step 3: Finally, the vapor pressure at the specific temperature will be displayed in the output field endstream endobj 71 0 obj<> endobj 73 0 obj<> endobj 74 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>> endobj 75 0 obj<> endobj 76 0 obj<> endobj 77 0 obj[/ICCBased 93 0 R] endobj 78 0 obj<> endobj 79 0 obj<> endobj 80 0 obj<> endobj 81 0 obj<>stream 0000002542 00000 n 0000008328 00000 n "The vapor pressure of pure water is 760mm at 25 degree Celsius. Solving for pv at 100C yields. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! PROBLEM SETUP. stream Use it to try out great new products and services nationwide without paying full pricewine, food delivery, clothing and more. Rate. Equation source. Our question is: Note that, for Clausius-Clapeyron equations, you must always use, In our example, let's say that our liquid is, Plugging our constants in to our equation, we get, The only difficult part of solving our equation (, ln(1/P2) = (40,650/8.314)((1/393) - (1/295)). It's also expressed by the following equation: Psolution=PsolventXsolvent\small P_{solution} = P_{solvent} \cdot X_{solvent}Psolution=PsolventXsolvent. At the same time, the rate at which water molecules in the vapor phase collide with the surface and reenter the solution is unaffected. The iterative procedure calculates the vapor pressure of a liquid fraction for the conditions specified by the RVP test, namely, original sample at 35oF, pressure test started at 60oF, equilibrium vapor/liquid volume of 4 (i.e., V/L = n = 4), and final equilibrium pressure measured at 100oF. The Journal of Chemical Thermodynamics 1977, 9 (2) , 153-165. https://doi.org/10.1016/0021-9614(77)90081-7; D. 0000002767 00000 n WebPentane Formula:C5H12 Molecular weight:72.1488 IUPAC Standard InChI:InChI=1S/C5H12/c1-3-5-4-2/h3-5H2,1-2H3Copy IUPAC Standard InChIKey:OFBQJSOFQDEBGM-UHFFFAOYSA-NCopy CAS Registry Number:109-66-0 Chemical structure: This structure is also available as a 2d Mol fileor as a computed3d SD file The 3d structure may be viewed using Javaor At 20C, the vapor pressures of pure benzene and toluene are 74.7 and 22.3 mmHg, respectively. How can I solve this problem? No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. n-hexane and isooctane (2,2,4-trimethylpentane). Method 1 Using the Clausius-Clapeyron Equation 1 Write the Clausius-Clapeyron equation. 0000001380 00000 n If you have the temperature in Centigrade, then you need to convert it with the following formula: The methods above work because energy is directly proportional to the amount of heat supplied. 0000001121 00000 n If you aren't familiar with natural logarithms (ln\footnotesize lnln) or the exponential growth constant (e\footnotesize ee), we highly recommend our logarithm calculator. %%EOF WebThe procedure to use the vapor pressure calculator is as follows: Step 1: Enter the temperature, molar enthalpy of vaporization, and x for the unknown in the input field. n-Pentane concentrations in gasoline and gasoline powered tailpipe emissions were 27,600 ug/g gasoline, 4,290 ug/km in a catalyst-equipped engine, 536,000 ug/km in a noncatalyst-equipped engine (7). , Check out 10 similar chemical thermodynamics calculators , Cell EMF Calculator Electromotive Force of a Cell, How to calculate vapor pressure? )%2F13%253A_Solutions_and_their_Physical_Properties%2F13.06%253A_Vapor_Pressures_of_Solutions, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), status page at https://status.libretexts.org. ", https://www.chem.purdue.edu/gchelp/liquids/vpress.html, https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/States_of_Matter/Phase_Transitions/Clausius-Clapeyron_Equation, https://chemistrytalk.org/clausius-clapeyron-equation/#:~:text=The%20Clausius%2DClapeyron%20equation%20relates,log%20of%20the%20vapor%20pressure, http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Solutions_and_Mixtures/Ideal_Solutions/Changes_In_Vapor_Pressure,_Raoult%27s_Law, https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Physical_Properties_of_Matter/Solutions_and_Mixtures/Ideal_Solutions/Changes_In_Vapor_Pressure%2C_Raoult's_Law, http://intro.chem.okstate.edu/1515SP01/Database/VPWater.html, http://www.traditionaloven.com/culinary-arts/sugars/raw-sugar/convert-liter-l-to-gram-g-raw-sugar.html, https://www.eiu.edu/eiuchem/forms/tutorial6.pdf, https://chemistrytalk.org/clausius-clapeyron-equation/, https://chem.libretexts.org/Bookshelves/General_Chemistry/Map%3A_General_Chemistry_(Petrucci_et_al.)/13%3A_Solutions_and_their_Physical_Properties/13.06%3A_Vapor_Pressures_of_Solutions. N-Pentane is an organic compound with the formula C5H12. PROCESS DATA. The relationship between solution composition and vapor pressure is therefore, \[ \color{red} P_A=X_AP^0_A \label{13.6.1}\], where \(P_A\) is the vapor pressure of component A of the solution (in this case the solvent), XA is the mole fraction of A in solution, and \(P^0_A\) is the vapor pressure of pure A. We use cookies to make wikiHow great. Solving for pv at 100C yields. Download the set of data (XLS - 82.01 KB), Latent heat of vaporization (at boiling point), Lower flammability limit (IEC 80079-20-1), Upper flammability limit (IEC 80079-20-1). N-Pentane is an organic compound with the formula C5H12. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. Most real solutions exhibit positive or negative deviations from Raoults law. How is vapor pressure affected by temperature? Chemical species. The curve between the critical point and the triple point shows the pentane boiling point with changes in pressure. We can understand this phenomenon qualitatively by examining Figure \(\PageIndex{1}\), which is a schematic diagram of the surface of a solution of glucose in water. We can do this as follows, using standard density, molar mass, and vapor pressure values for our two chemicals: Mass (benzene): 60 mL = .060 L × 876.50 kg/1,000 L = 0.053 kg =, Mass (toluene): .060 L × 866.90 kg/1,000 L = 0.052 kg =, Moles (benzene): 53 g 1 mol/78.11 g = 0.679 mol, Moles (toluene): 52 g 1 mol/92.14 g = 0.564 mol, Mole fraction (benzene): 0.679/1.243 = 0.546, Mole fraction (toluene): 0.564/1.243 = 0.454. You want to calculate. Please read AddThis Privacy for more information. Consequently, if we reduce environmental pressure as it happens in reality at higher altitudes, we get a lower boiling point. The same result is obtained using either method. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. Liquid Phase. Figure \(\PageIndex{2}\) shows two beakers, one containing pure water and one containing an aqueous glucose solution, in a sealed chamber. Have you ever left a bottle of water out in the hot sun for a few hours and heard a slight "hissing" noise when you opened it? Given: identity of solute, percentage by mass, and vapor pressure of pure solvent. If you're unsure what vapor pressure is, keep scrolling. Let's use this vapor pressure equation in an exercise: What is the vapor pressure of a solution made by dissolving 100 grams of glucose (C6H12O6) in 500 grams of water? Chemical structure: This structure is also available as a 2d Mol fileor as a computed3d SD file. Science. By multiplying both sides by the exponent, we get: 102325P2=e1.1289\small \frac{102325}{P_2} = e^{1.1289}P2102325=e1.1289. Give it a go! At 100C, the vapor pressure of pure water is 760 mmHg. Contact the regional Air Liquide team for expertise service. Consider, for example, the vapor pressure of solutions of benzene and toluene of various compositions. Blue fields allow input; press to calculate. Liquid Phase. Please read AddThis Privacy for more information. Accuracy: For many substances, vapor pressures are only poorly known; expect errors up to a few 10% of the vapor pressure value and up to approx. Equation source. WebCAS Registry Number:109-66-0. dPdT=HTV\small \frac{dP}{dT} = \frac{H}{T \cdot \Delta V}dTdP=TVH. To calculate vapor pressure, use the Clausius-Clapeyron equation, which includes the variables for the enthalpy of the liquid, the real gas constant, the starting and final temperatures, and the starting and final vapor pressures. Some of our calculators and applications let you save application data to your local computer. Calculate the decrease in the vapor pressure of water at 25C caused by this concentration of \(NaCl\), remembering that 1 mol of \(NaCl\) produces 2 mol of solute particles. Chemical species. 0000007173 00000 n We don't save this data. The vapor pressure of water calculator is a handy tool that can help in determining the vapor pressure of water and ice. Bess Ruff is a Geography PhD student at Florida State University. WebThe procedure to use the vapor pressure calculator is as follows: Step 1: Enter the temperature, molar enthalpy of vaporization, and x for the unknown in the input field. 0000001395 00000 n endstream Uses formula: log e P m m H g = {\displaystyle \scriptstyle \log _{e}P_{mmHg}=} log e ( 760 101.325 ) 10.41840 log e ( T + 273.15 ) 5778.024 T + 273.15 + 81.92460 + 1.178208 10 5 ( T + 273.15 ) 2 {\displaystyle \scriptstyle \log _{e}({\frac {760}{101.325}})-10.41840\log _{e}(T+273. 0000000977 00000 n By signing up you are agreeing to receive emails according to our privacy policy. N-Pentane is an organic compound with the formula C5H12. Solve the equation for the pressure by following the order of operations. Plug all of the known variables and constants into the equation, and isolate the unknown variable, which will be the pressure. Wondering how many helium balloons it would take to lift you up in the air? You will get the resulting temperature: 86.35C. Chemical structure: This structure is also available as a 2d Mol fileor as a computed3d SD file. Solutions that obey Raoults law are called ideal solutions. If the solution contains only a single nonvolatile solute (B), then \(X_A + X_B = 1\), and we can substitute \(X_A = 1 X_B\) to obtain, \[\begin{align} P_A &=(1X_B)P^0_A \\[4pt] &=P^0_AX_BP^0_A \label{13.6.2} \end{align}\]. We expect the AB interactions to be comparable in strength to the AA and BB interactions, leading to a vapor pressure in good agreement with that predicted by Raoults law (an ideal solution). Google use cookies for serving our ads and handling visitor statistics. <> 1 <<>> 2 <<>> 3 <<>> 4 <> 5 <> 6 <> 7 <> 8 <> 9 <> 10 <> 11 <> 12 <> 13 <> 14 <> 15 <> 16 <> 17 <> 18 <> 19 <> 20 <> 21 <> 22 <<>> 23 <<>>]>>/Type/Catalog/ViewerPreferences<>/PageLayout/TwoPageRight/Pages 116 0 R/OutputIntents[120 0 R]/Metadata 122 0 R>> You can rearrange the above equation to solve for P2\footnotesize P_2P2: P2=102325e1.1289=33090Pa\small P_2 = \frac{102325}{e^{1.1289}} = 33090\space PaP2=e1.1289102325=33090Pa. As you see, it's a bit complicated to do this calculation by hand. Stay connected and follow us on your favorite platforms: Corken Railcar Storage Tank Transfer Video. At boiling point at 1.013 bar. Calculate the pressure, in atm, of pentane vapor in equilibrium with pentane liquid at 298 K. Equation \ref{13.6.1} is known as Raoults law, after the French chemist who developed it. Chemical species. Calculate the vapor pressure of an aqueous solution containing 30.2% ethylene glycol by mass, a concentration commonly used in climates that do not get extremely cold in winter. We can use the Omnicalculator tool Vapor pressure calculator or the Clausius Clapeyron equation as follows: Define a boiling temperature and pressure you know. Method 1 Using the Clausius-Clapeyron Equation 1 Write the Clausius-Clapeyron equation. WebPentane Formula:C5H12 Molecular weight:72.1488 IUPAC Standard InChI:InChI=1S/C5H12/c1-3-5-4-2/h3-5H2,1-2H3Copy IUPAC Standard InChIKey:OFBQJSOFQDEBGM-UHFFFAOYSA-NCopy CAS Registry Number:109-66-0 Chemical structure: This structure is also available as a 2d Mol fileor as a computed3d SD file The 3d structure may be viewed using Javaor Finding Vapor Pressure of a Solution (Nonionic-Volatile Solute): The vapor pressure of the solution is proportional to the mole fraction of solvent in the solution, a relationship known as Raoults law. 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