Question

IV) Which is the best explanation for the negative sign of ASº in the following reaction? CaSO4(s) → Ca2+(aq) + SO42- (aq) AS° =-143 J mol-1 K -1 (A) There are more ways of arranging the Ca2+ and SO42- ions in aqueous solution than in the crystal lattice. (B) Solid CaSO4 is a network covalent solid, whereas it separates into ions in aqueous solution. (C) Aqueous Ca2+ and SO42- ions are tightly solvated, decreasing the number of ways of arranging water molecules when the solid dissolves. (D) Calcium sulfate dissolves exothermically, leading to a net loss of entropy. V) Which reaction has the greatest increase in entropy, AS? (A) 2Mg(s) + O2(g) → 2MgO(s) (B) 2C2H2(g) +502(g) → 4CO2(g) + 2H2O(1) (C) 2KCIO3(s) → 2KCI(S) + 3O2(g) (D) 2SO2(g) + O2(g) → 2503(g)

Answer 1

☺ When Cason(s) get dissolved in water then due to the nature of casoj as strong electrolyte this get diso dissociated fully as cast and 509?-ion. In the solution Ca2+ and son? long are tightly solvoted, decreasing the number of ways of arrarging water molecules when the solid dissolves, so the correct answer is ro . The entropy of a reaction increases when number. of particles increases. Among the given reactions He reaction © where the number of products particles are more compare to number of reactant particks, Hence for the reaction © a entropy increases, so the correct answer is to