which of the following reaction leads to an increase in entropy of the system? a) NH4Cl(s) -> HCl(g)+NH3(g) b)CH4(g)+2O2(g) -> CO2(g) +H2O(l) c) CaO(s)+CO2(g) -> CaCO3(s) d)4Fe(s)+3O2(g)->2Fe2O3(s) e)2HI(g)+Cl2(g) ->2HCl(g)+I2(s)

For each of the following reactions determine if the change in entropy was positive or negative:A) Water at 40°C → Water at 25°CB) 2NO2(g) → N2O4(g)C) CH3OH (l) → CH3OH (g)D) PbCl2(s) → PbCl2(aq)

< 8:41 1 4 7 +/- Question 1 of 17 When heated, CaCO3 decomposes into CaO and CO₂ according to the following equation: CaCO3(s) CaO(s) + CO₂(g) This is an endothermic reaction in which AH° = 178.3 kJ/mol and in which entropy increases, AS° = 159 J/mol K. To what temperature (in °C) must CaCO3 be heated in a closed container in order to produce CO₂ at an equilibrium pressure of 0.250 atm? (Assume AH° and AS° do not change appreciably with temperature). 2 5 8 °C 3 60 9 O Submit Tap here or pull up for additional resources XU x 100

Which reaction below has a positive change in entropy? O 2 N20 (g) --> 2 N2 (g) O2 (e) O N2 (g) + 3 H2 (g) -- 2 NH3 (g) O 2 KCIO3 (s) --> 2 KCI (s) + 3 O2 (g) O 2 H2 (e) C2H2 (g)--> C2H, (g).

Does the entropy increase or decrease in these reactions? Why? a) 4 Al + 3 O2 → 2 Al2O3 b) C + 2 Cl2 → CCl4 c) H2O (l) → H2O (g) d) CCl4 → C + 2 Cl2

For the equation:   CH3OH (l) + 3/2 O2(g) -> CO2 (g) +2H2O   What drives this reaction to go in the forward direction? Entropy, Enthropy, both, or neither?

O ENTROPY AND FREE ENERGY Using reaction free energy to predict equilibrium composition D 3/5 Consider the following equilibrium: 2NOC1 (g) - 2NO (g)+ Cl, (g) AG" =41. kJ Now suppose a reaction vessel is filled with 2.68 atm of nitrosyl chloride (NOCI) and 3.74 atm of chlorine (Cl,) at 227. °C. Answer the following questions about this system: rise Under these conditions, will the pressure of Cl, tend to rise or fall? fall Is it possible to reverse this tendency by adding NO? In other words, if you said the pressure of Cl, will tend to rise, can that yes be changed to a tendency to fall by adding NO? Similarly, if you said the no pressure of Cl, will tend to fall, can that be changed to a tendency to rise by adding NO? If you said the tendency can be reversed in the second question, calculate the minimum pressure of NO needed to reverse it. | atm Round your answer to 2 significant digits. II

Which one of the following choices of gaseous molecules is rank ordered correctly from lowest standard molar entropy (left hand side) to highest standard molar entropy (right hand side)?     He, Ne, CO, SiH4     SiH4 , CO, Ne, He     SiH4 , Ne, CO, He     CO, SiH4 , Ne, He

given rgetable of standard molar entropy values of each substance in the reaction below, what is the standard change in entropy, delta s, for the following reaction? 2CH3OH(g)+3OH2- 2CO2(g)+4H2O(g) Substance= CH3OH(g) S(J/mol•K) 240 Substance=O2(g) S(J/mol•K) 205 Substance=CO2(g) S(J/mol•K) 214 Substance=H2O(g) S(J/mol•k) 189 a. -352 J/K b. -1302 J/K c. 315 J/K d. 89 J/K E. 1830 J/K