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Home /thermodynamics

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Asked: March 30, 2021In: Education

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

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The enthalpy of vaporisation of a substance is 8400 J mol-1 and its boiling point is –173°C. The entropy change for vaporisation is :

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One mole of which of the following has the highest entropy?

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Third law of thermodynamics provides a method to evaluate which property?

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A weak acid HX has the dissociation constant 1 × 10-5 M. It forms a salt NaX on reaction with alkali. The degree of hydrolysis of 0.1 M solution of NaX is

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The pH of a 10-10 M NaOH solution is nearest to

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What is the pH of a 0.10 M solution of barium hydroxide, Ba (OH)2?

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Which of the following aqueous solutions will have highest pH?

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A physician wishes to prepare a buffer solution at pH = 3.85 that efficiently resists changes in pH yet contains only small concentration of the buffering agents. Which of the following weak acids together with its sodium salt would be best to use?

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The solubility of Ca3​(PO4​​)2​ in water is y mol/L. Its solubility product is:

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