26. Which of the following is true for the cordensation of a ganeous subtans ous

Question

26. Which of the following is true for the cordensation of a ganeous subtans ous substance? 12p) 27. Which of the following compounds has the highest standard entropy per male at 298 K? 12 pt) (A) HO() (8) Cacoa est ( colo? IDI sots) 28. In which reaction is AS' expected to be negative? 12 pt) (E)CH.OM In (DI cokgcods) (E) all of above 29 Given the following, determine S at 298 K for one mole of NOlg). (3 pt Substance lml8 a1 298K Noig) Ouig) NO.fg) 205.1 240.0 (A) 210.9 /x (8)-90.85 K (C) 421.7 / (D)-421.7 1/ (E)+90.85 J/ Which of the follwing is the best criterion for determining the spontaneity of a chemical reaction? (2 pt)

Explanation / Answer

26) answer: D

because condensation means heat releases(DH<0), entropy decreases(DS<0)

27) ANSWER: c) co(g) gases are having higher entropy than liquids,solids.

28) answer: A (no of mol of gases reactant is higher than products)

29) DS0rxn = (2*S0f,NO2)-(2*S0f,NO + 1*S0f,O2)

         -146 = (2*240)-(2*X+1*205.1)

   X = S0 of NO = 210.45 j/mol.k at 298 k

answer: A

30) answer: C) DG

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