CHEM 132 Review 8. Without doing any calculations, predict the sign of As for th
ID: 526758 • Letter: C
Question
CHEM 132 Review 8. Without doing any calculations, predict the sign of As for the reaction between zinc solid and aqueous hydrochloric acid. Explain your reasoning in one or two Zn(s) 2 HCl(aq) ZnCl2(aq) H2(g0 9. Which of the following reactions will have the largest equilibrium constant (Kea) at 298 K? a. Cacoh(s) CaO(s) CO2(g) AG" +131.1 4G -180.8 c. 302(g) 20s (g) d. Fezov(s) 3 co(g) 2 Fe(s) 3 CO2(g) AG --28.0 10. Calculate AG for the reaction below at 25.0 "c given AH .-231.1 and AS 287.6 J/K. Is the reaction spontaneous as written? 11. The Haber-Bosch Process is a thermodynamically favorable and spontaneous reaction at standard temperatures and pressures. At high temperature, however, the reaction is not spontaneous. What does this imply about the signs (positive or negative) of the thermodynamic state functions, AG, AH, and as, at standard temperature? N2(g) 3H2(g) 2NHalg) 12. What is the sign of as for each of the following reactions? N2(g) 3 H2(g) 2 NH,(g) 13. What is as for the following reaction? NH3 s U/mol K 192.8 205.2 2108 188.8Explanation / Answer
q8.
dS = entropy change
entropy = measure of chaos
analysis:
solid Zn and aqueous HCl is going to form
aqueous ZnCl2, and H2Gas
there are two chaos being formed:
- The destruction of the organized "lattice" crystal of solid Zinc (increases chaos)
- The production of H2 gas, which implies chaos and disorcer (gases are chaotic)
therefore
this should have a very positive entropy generation