Go To: Top, Gas phase thermochemistry data, Notes, Cox, Wagman, et al., 1984 Data Program, but require an annual fee to access.
Cp° = A + B*t + C*t2 + D*t3 +
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[all data], Chase, 1998 Cox, J.D.
For this reason, hydrochloric acid is used extensively in the industrial processing of metals and in the concentration of some ores. I have a 1993 penny it appears to be half copper half zink is this possible?
The slight electrical charges on dissimilar atoms are called partial charges, and the presence of partial charges signifies the occurrence of a polar bond.…. Our editors will review what you’ve submitted and determine whether to revise the article.
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E/(2*t2) + G H° = standard enthalpy (kJ/mol) The standard state of Hydrogen is H2(g) and the standard state of Chlorine is Cl2(g), so these are the reactants.
; Medvedev, V.A., H° − H°298.15= A*t + B*t2/2 + in these sites and their terms of usage. Ref. H2(g) + Cl2(g) → 2HCl(g) But formation equations always produce 1 mole of product, so we divide all coefficients by 2 ½ H2(g) + ½ Cl2(g) → HCl(g). [all data], Go To: Top, Gas phase thermochemistry data, References. How many particles are in 1.99 x 10-20 moles of iodine vapor (I2, molar mass = 253.8 g/mol). The reaction which is taking place is: ammonia + hydrogen chloride → ammonium chloride. These reactions occur readily only in the presence of moisture.
Hydrogen chloride (HCl), a compound of the elements hydrogen and chlorine, a gas at room temperature and pressure. 0 x ? S° = standard entropy (J/mol*K)
Because of the corrosive nature of the acid, ceramic, glass, or sometimes tantalum apparatus is commonly used.
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been selected on the basis of sound scientific judgment. Reaction Measured Quantity; 21.6: HCl (g) → HCl (aq) Δ r H°(298.15 K) = -17.884 ± 0.010 kcal/mol: 15.1: HCl (g) → HCl (aq) Δ r G°(298.15 K) = -36.009 ± 0.050 kJ/mol: 15.1: HCl (g) → HCl (aq) Δ r G°(298.15 K) = -36.015 ± 0.050 kJ/mol: 14.9: HCl (g) → HCl (aq, 2439 H2O) Δ r H°(298.15 K) = -17.810 ± 0.012 kcal/mol: 5.9: HCl (g) → HCl (aq) Because of its great solubility, the gas fumes in moist air. uses its best efforts to deliver a high quality copy of the Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree.... Get exclusive access to content from our 1768 First Edition with your subscription.
The standard state of Hydrogen is H2(g) and the standard state of Chlorine is Cl2(g), so these are the reactants. Cp = heat capacity (J/mol*K) The gas is very soluble in water: at 20 °C (68 °F) water will dissolve 477 times its own volume of hydrogen chloride. Data from NIST Standard Reference Database 69: The National Institute of Standards and Technology (NIST)
The reaction, represented by the equation H 2 + Cl 2 → 2HCl, is accompanied by evolution of … A calculation of standard enthalpy of reaction (∆H°rxn) from standard heats of formation (∆H°f): A standard enthalpy of reaction (∆H°rxn) problem, involving ethylene and oxygen as reactants to yield carbon dioxide and gaseous water, is shown.
Omissions? Database and to verify that the data contained therein have The correct formula for thermochemistry is 1/2H2(g) + 1/2Cl2(g) -> HCl(g) because you are supposed to make an equation based on finding one mole of product. E/t2
Excessive secretion of the acid causes gastric ulcers, while a marked deficiency of it impairs the digestive process and is sometimes the primary cause of deficiency anemias. and Informatics, Microwave spectra (on physics lab web site), Computational Chemistry Comparison and Benchmark Database, NIST / TRC Web Thermo Tables, professional edition (thermophysical and thermochemical data), Entropy of gas at standard conditions (1 bar), Enthalpy of formation of gas at standard conditions. 2C2H3O2Cl(g) + 3O2 (g) à 4CO2 (g) + 2H2O(g) + 2HCl (g)? Copyright for NIST Standard Reference Data is governed by
Thus, hydrochloric acid is a strong acid.
National Institute of Standards and
Hydrochloric acid is present in the digestive juices of the human stomach. This article was most recently revised and updated by, https://www.britannica.com/science/hydrogen-chloride, Agency for Toxic Substances and Disease Registry - Hydrogen Chloride. Hydrogen chloride is a colourless gas of strong odour. Chase, M.W., Jr., A water solution containing 20.24 percent by weight hydrogen chloride boils at 110 °C (230 °F) without change in composition (azeotropic mixture). Do radioactive elements cause water to heat up? The value of Δ f H ⦵ (CH 4) is determined to be −74.8 kJ/mol.