2. Predict (do not calculate) the sign of AS for the following reactions a. 2K(s

Question

2. Predict (do not calculate) the sign of AS for the following reactions a. 2K(s) +F (g)2KF (s) b. NaCIO3 (sN (aq)CiO3 (aq) c. HCI (a)NaOH (aq) NaH20 (I) 3. 4NH3 (g)+502 (g) 4 NO (g) 6H20 (g) AHrn--906 k Is entropy increasing or decreasing for the system? Is entropy increasing or decreasing for the surroundings? Is the reaction spontaneous? a. b. c. i. Yes ii. No iii. Maybe AS®, ???, and AG" can be determined just like ??0 is determined from ??®, values. Using the values in the table below, calculate AS®, ??', and ?G° for the following reaction at 298K. Indicate if the reaction is spontaneous or not. 4. 2H20 (g)2H2 (g) O2 (g) S° (J/mol*K) 205.0 130.6 188.72 AG°r (kJ/mol) Substance 02 (g) H2 (g) AH°f (kJ/mol) 0 0 241.826 H20 (g) -228.60 transcribed image text

Explanation / Answer

Ans2: Entropy is a measure of randomness or disorder of a system . When solid phase of component changes to liquid phase ,Entropy increases and when liquid phase changes to gaseous phase , Entropy again increases.

a - 2K(s) +F2(g) = 2KF(s)

As 2 moles of solid and 1 mole of gas combines to form 2 moles of solid , so , deltaS <0

b - NaClO3(s) = Na+(aq) + ClO3- (aq)

As 1mole of solid gives 1-1 mole of 2 aqueous species . Then , deltaS>0

c - HCl(aq) + NaOH(aq) = NaCl(aq) + H2O(l)

As 1mole of aqueous HCl combines with 1 mole of aqueous NaOH to give 1 mole of aqueous NaCl .So , deltaS<0.

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