MULTIPLE CHOICE. Choose the one alternative that best completes the statement or

Question

MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answ Consider the following gas-phase reaction of A2 (shaded spheres) and B2 (unshaded spheres) A2()+B26) -2 AB(g) AG +25k 1) 1) Which of the above reaction mixtures has the most spontaneous forward reaction? B) (2) D) (4) C) (3) 2) In figure (1) below oxygen molecules, represented by unshaded spheres, and chlorine molecules, 2) represented by shaded spheres, are in separate compartments. Figure (2) shows the equilibrium state of the system after the stopcock separating the two compartments is opened. Assuming the oxygen and the chlorine behave as ideal gases, what are the signs (+,-, or 0) of AHAS, and G for this processi? 3_ 3) AS--198.7 J/K for the reaction shown below. Calculate S for NH3(g) N2(g)+3 H2(g)-2 NH3(G) Species S JK mol) 191.5 N28) H2(g) NH3(g) 130.6 C) 1923 J/K mol D) 123.4 J/K mol B) 61.7 J/K mol A) 384.6 J/K mol

Explanation / Answer

Q1

most spontaneous forward must be the MOST A2 and B2, since dG is positive, favour reactatns

then

A has the most A2 and B2, therefore A will be most spontaneous

Q2

a)

the reaction will break lots of O=O and Cl-Cl bonds, so this is negative enthalpy, i.e. release of heat

dS = entropy increases, since 2 ordered systems become 1 s sinlge mixed chatoic system

dG = dH - T*dS

if dH is negative, adnd dS is positive, then dG is always negative

choose A

Q3

dS = Sproducts - Sreactant

dS = 2NH3 - (N2 +3H2)

-198.7 = 2*NH3 - (191.5 +3*130.6)

NH3 = -198.7 +(191.5 +3*130.6)

NH3 = 384.6 J/Kmol

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