molaladj.

Brit.

/ˈməʊləl/, U.S.

/ˈmoʊləl/

Origin: Formed within English, by derivation. Etymons: mole n.⁸, -al suffix¹.

Etymology: < mole n.⁸ + -al suffix¹. Compare earlier molar adj.⁴

Physical Chemistry.

1. = molar adj.⁴ 1. Cf. molecular adj. 1c.

ΘΚΠ

the world > matter > chemistry > units or measurements > [adjective] > of or relating to moles

molecular1867

molar1902

molal1908

1908 H. M. Goodwin & R. D. Mailey in Physical Rev. 26 49 In the fifth column we have computed the values of the fluidity F divided by the corresponding molecular volume ϕ of the liquid; this we have denoted by f and called the molal fluidity.

1923 G. N. Lewis & M. Randall Thermodynamics iii. 22 If w is the molal mass of a substance (also known as molal weight or molecular weight), a mol of the substance in question is defined as w grams.

1972 Science 2 June 1011/2 Carbon dioxide..has a molecular weight M of 44 and a partial molal volume of 34·8 ml/mole.

1992 Jrnl. Physical Chem. 96 407/2 The mean molal activity coefficient of pure CoCl₂..at 298.15 K for I = 3.0 mol kg⁻¹ is 0.531.

2. Of a solution: containing one mole, or a specified number of moles, of solute per kilogram of solvent or (now rare) per litre of solution. Also: designating or relating to a concentration expressed in terms of these quantities. Cf. molar adj.⁴ 2.

ΘΚΠ

the world > matter > chemistry > units or measurements > [adjective] > of or relating to moles > specifically of a solution

molal1923

molar1927

1923 G. N. Lewis & M. Randall Thermodynamics iv. 33 When we speak of a molal or tenth molal aqueous solution.., we shall refer, not to the concentration, but to the number of mols of solute in 1000 grams of water, which we may call the molality.

1930 W. T. Hall Textbk. Quantitative Analysis iii. 26 A solution is said to be molal in hydrogen ions if it contains 1·008 g of H⁺ per liter.

1938 G. E. F. Lundell & J. I. Hoffman Outl. Methods Chem. Analysis xxxv. 127 One author will regard a solution containing one mole of solute per liter of solution as molal, whereas another calls such a solution molar.

1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. vii. 250 The activity coefficient is then around 10⁻¹⁴ for molal solutions of these ions.

1989 R. Dryer & G. Lata Exper. Biochem. i. i. 14 One gram molecular weight dissolved in 1000g solvent gives a 1 molal solution.

1999 Cryobiology 38 119 Sugars were added on a molal basis (0.1, 0.5, and 1 m).

This entry has been updated (OED Third Edition, September 2002; most recently modified version published online March 2022).

单词	molal
释义	molaladj. Brit. /ˈməʊləl/, U.S. /ˈmoʊləl/ Origin: Formed within English, by derivation. Etymons: mole n.⁸, -al suffix¹. Etymology: < mole n.⁸ + -al suffix¹. Compare earlier molar adj.⁴ Physical Chemistry. 1. = molar adj.⁴ 1. Cf. molecular adj. 1c. ΘΚΠ the world > matter > chemistry > units or measurements > [adjective] > of or relating to moles molecular1867 molar1902 molal1908 1908 H. M. Goodwin & R. D. Mailey in Physical Rev. 26 49 In the fifth column we have computed the values of the fluidity F divided by the corresponding molecular volume ϕ of the liquid; this we have denoted by f and called the molal fluidity. 1923 G. N. Lewis & M. Randall Thermodynamics iii. 22 If w is the molal mass of a substance (also known as molal weight or molecular weight), a mol of the substance in question is defined as w grams. 1972 Science 2 June 1011/2 Carbon dioxide..has a molecular weight M of 44 and a partial molal volume of 34·8 ml/mole. 1992 Jrnl. Physical Chem. 96 407/2 The mean molal activity coefficient of pure CoCl₂..at 298.15 K for I = 3.0 mol kg⁻¹ is 0.531. 2. Of a solution: containing one mole, or a specified number of moles, of solute per kilogram of solvent or (now rare) per litre of solution. Also: designating or relating to a concentration expressed in terms of these quantities. Cf. molar adj.⁴ 2. ΘΚΠ the world > matter > chemistry > units or measurements > [adjective] > of or relating to moles > specifically of a solution molal1923 molar1927 1923 G. N. Lewis & M. Randall Thermodynamics iv. 33 When we speak of a molal or tenth molal aqueous solution.., we shall refer, not to the concentration, but to the number of mols of solute in 1000 grams of water, which we may call the molality. 1930 W. T. Hall Textbk. Quantitative Analysis iii. 26 A solution is said to be molal in hydrogen ions if it contains 1·008 g of H⁺ per liter. 1938 G. E. F. Lundell & J. I. Hoffman Outl. Methods Chem. Analysis xxxv. 127 One author will regard a solution containing one mole of solute per liter of solution as molal, whereas another calls such a solution molar. 1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. vii. 250 The activity coefficient is then around 10⁻¹⁴ for molal solutions of these ions. 1989 R. Dryer & G. Lata Exper. Biochem. i. i. 14 One gram molecular weight dissolved in 1000g solvent gives a 1 molal solution. 1999 Cryobiology 38 119 Sugars were added on a molal basis (0.1, 0.5, and 1 m). This entry has been updated (OED Third Edition, September 2002; most recently modified version published online March 2022). < adj.1908
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