Discuss the interpretation of the following: (a) AfH (298 K) becomes less negative along the series LiF, NaF, KF, RbF, CsF, but more negative along the series Lil, Nal, KI, RbI, CsI. (b) The thermal stability of the isomorphous sulfates of Ca, Sr and Ba with respect to decomposition into the metal oxide (MO) and SO3 increases in the sequence CaSO4 < SrSO4 < BaSO4.

Discuss the interpretation of the following: (a) AfH (298 K) becomes less negative along the series LiF, NaF, KF, RbF, CsF, but more negative along the series Lil, Nal, KI, RbI, CsI. (b) The thermal stability of the isomorphous sulfates of Ca, Sr and Ba with respect to decomposition into the metal oxide (MO) and SO3 increases in the sequence CaSO4 < SrSO4 < BaSO4.

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter21: Chemistry Of The Nonmetals

Section: Chapter Questions

Problem 57QAP: Sodium hypochlorite is produced by the electrolysis of cold sodium chloride solution. How long must...

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Sodium hypochlorite is produced by the electrolysis of cold sodium chloride solution. How long must a cell operate to produce 1.500103 L of 5.00% NaClO by mass if the cell current is 2.00103 A? Assume that the density of the solution is 1.00 g/cm3.
Consider the equilibrium 21(8) — 12(8) Calculate the standard change in enthalpy, AH AH = 62.25 kJ/mol for l₂(g) and AH, 106.6 kJ/mol for I(g).
Give appropriate reason for each of the following :(i) Metal fluorides are more ionic than metal chlorides.(ii) Perchloric acid is stronger than sulphuric acid.(iii) Addition of chlorine to KI solution gives it a brown colour but excessof Cl2 makes it colourless.
Like heavy water (D₂O), so-called “semi-heavy water”(HDO) undergoes H/D exchange. The scenes below depict aninitial mixture of HDO and H₂ reaching equlibrium.(a) Write the balanced equation for the reaction. (b) Is the valueof Kgreater or less than 1? (c) If each molecule depicted repre-sents 0.10 M, calculate K.
Accounts for the following(i) Rusting of iron is quicker in saline water than in ordinary water.(ii) Blocks of magnesium are straped to the steel hubs of ocean going ships.
Gibbs Free Energy for Nonspontaneous Reactions and Reactions at Equilibrium Consider the given Ellingham diagram. Rank the oxides of Mg, Zn, and Al in terms of increasing stability at 1000 ºC (1 being the least stable, 3 being the most stable).
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(a) Mention the optimum conditions for the industrial manufacture of ammonia by Haber’s process. (b) Explain the following giving appropriate reasons: (i) Sulphur vapour exhibits paramagnetic behaviour: (ii) Red phosphorus is less reactive than white phosphorus
For alkaline earth metal carbonates, what is the trend of their thermal stability descending the group? Explain why.
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Boron nitride (BN) is made by the reaction of boron trichloride with ammonia.(a) Write a balanced chemical equation for this reaction.(b) Calculate the standard enthalpy change per mole of BN produced, given that the standard molar enthalpy of formation of BN(s) is 254.4 kJ mol-1.(c) Predict (qualitatively) the following physical properties of boron nitride: conductivity, melting point, and hardness.
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