2) Above what temperature does the following reaction become nonspontaneous? 2)

Question

2) Above what temperature does the following reaction become nonspontaneous? 2) 2H2S(g) +302(g) 2SO2(g) +2H20(g) AH=-1036 kt AS--1532UK A) 6.762 x 103 K B) 298 K c) 158.7 K D) This reaction is nonspontaneous at all temperatures. E) This reaction is spontaneous at all temperatures. 3) Calculate AS rxn for the following reaction. The S for each species is shown below the reaction. 3 C2H2(9) + H2g) C2H4(g) S (Vmol K) 200.9 130.7 219.3 4) 4) Estimate GTXn for the following reaction at 4490 K. CH20(g) + 2 H2(g) CH4(g) + H20(g) 4°:-94.9 kt AS, .2242 yK B) -101 kJ c) +24 kJ D) +58 kJ E)-4.2kJ A) +129 kJ 5) 5) Calculate the AG rxn using the following information. G.rxn ? 3NO2(g) + H20(1) 51.3-237.1 C) +51.0 kJ 2HNO3(aq) + NO(g) G.f (k/mol) -110.9 87.6 D) +171.1 kJ E) -1625 kJ A)-87.6 kJ B)-54.5kJ

Explanation / Answer

2)

deltaHo = -1036.0 KJ/mol

deltaSo = -153.2 J/mol.K

= -0.1532 KJ/mol.K

we have below equation to be used:

deltaGo = deltaHo - T*deltaSo

for reaction to be spontaneous, deltaGo should be negative

that is deltaGo<0

since deltaGo = deltaHo - T*deltaSo

so, deltaHo - T*deltaSo < 0

-1036.0- T *-0.153< 0

T * 0.153 < 1036.0

T < 6762 K

Answer: A

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