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342.15 g/mol (anhydrous) ... or by heating aluminium in a sulfuric acid solution: ... and a solution of aluminium sulfate of specific gravity 1.16 is prepared.
Potassium alum is now produced industrially by adding potassium sulfate to a concentrated solution of aluminium sulfate. [33] The aluminium sulfate is usually obtained by treating minerals like alum schist, bauxite and cryolite with sulfuric acid. [34] If much iron should be present in the sulfate then it is preferable to use potassium chloride ...
J/(mol·K) Std enthalpy change of vaporization, Δ vap H o? kJ/mol Std entropy change of vaporization, Δ vap S o? J/(mol·K) Solid properties Std enthalpy change of formation, Δ f H o solid-3440 kJ/mol Standard molar entropy, S o solid? J/(mol K) Heat capacity, c p? J/(mol K) Liquid properties Std enthalpy change of formation, Δ f H o liquid ...
Alum in the form of potassium aluminium sulphate or ammonium aluminium sulfate in a concentrated bath of hot water is regularly used by jewelers and machinists to dissolve hardened steel drill bits that have broken off in items made of aluminum, copper, brass, gold (any karat), silver (both sterling and fine) and stainless steel. This is ...
m(NaCl) = 2 mol/L × 0.1 L × 58 g/mol = 11.6 g. To create the solution, 11.6 g NaCl is placed in a volumetric flask, dissolved in some water, then followed by the addition of more water until the total volume reaches 100 mL. The density of water is approximately 1000 g/L and its molar mass is 18.02 g/mol (or 1/18.02 = 0.055 mol/g). Therefore ...
Δ f H ⦵ /(kJ/mol) Aluminium: Solid Al 0 Aluminium chloride: Solid AlCl 3: −705.63 Aluminium oxide: Solid Al 2 O 3: −1675.5 Aluminium hydroxide: Solid Al(OH) 3: −1277 Aluminium sulphate: Solid Al 2 (SO 4) 3: −3440 Barium chloride: Solid BaCl 2: −858.6 Barium carbonate: Solid BaCO 3: −1216 Barium hydroxide: Solid Ba(OH) 2: −944.7 ...
The standard Gibbs free energy of formation (G f °) of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the most stable form of the element at 1 bar of pressure and the specified temperature, usually 298.15 K or 25 °C).
Note that the especially high molar values, as for paraffin, gasoline, water and ammonia, result from calculating specific heats in terms of moles of molecules. If specific heat is expressed per mole of atoms for these substances, none of the constant-volume values exceed, to any large extent, the theoretical Dulong–Petit limit of 25 J⋅mol ...