The factors that lead to an increase in entropy are: (1) a transition from a condensed phase to the vapor phase (2) a reaction that produces more product species than reactant species in the same phase (3) a process where the product molecule has greater molecular complexity relative to the reactant's molecular complexity | |||
(a) PCl3(l) + Cl2(g) → PCl5(s) In this reaction, a gas reacts with a liquid to form a solid. There is a decrease in the number of moles of gas; thus, a decrease in microstates. ΔS is negative. | |||
(b) 2HgO(s) → 2Hg(l) + O2(g) In this reaction, a solid decomposes to produce a liquid and a gas. There is an increase in microstates. ΔS is positive. | |||
(c) H2(g) → 2H(g) In this reaction, there are two moles of gas in the products and one mole of gas in the reactants. An increase in the number of moles of gas means an increase in microstates. ΔS is positive. | |||
(d) U(s) + 3F2(g) → UF6(s) A gas reacts with a solid to form a solid. There is a decrease in the number of moles of gas in the products relative to the reactants; thus, a decrease in microstates. ΔS is negative. |
Short Answer: (4 points each) 1.) Predict whether the entropy change is positive or negative for...
3 attempts left Check my work Be sure to answer all parts. State whether the sign of the entropy change expected for each of the following processes will be positive, negative, or equal to zero. (a) PC13(0) + Cl2(g) - PCIs(s) AS (select) (select) (b) 2HgO(s) + 2Hg(0) + O2(g) (c) H2(g) → 2H(g) (d) U(s) + 3F2(g) → UF6(S) AS (select) VO
Predict whether the entropy change is positive or negative for each of the following reactions. Give reasons for your predictions. a. 2 KClO4(s) + 2 KClO3(s) + O2(g) b. H2O(g) → H20(1) c. 2 Na(s) + 2 H20(1) ► 2 NaOH(aq) + H2(g) d. N2(g) → 2 N(g)
1. Predict whether the entropy change for each of the following reactions will have a positive value or a negative value. Calculations are not necessary! (a) CH4 (g) + H2O (g) → C2H5OH (g) (b) 2 NO2 (g) → 2 NO (g) + O2 (g) (c) A1203 (s) + 3 H2 (g) → 2 Al(s) + 3 H2O (1)
Predict whether the entropy change for each of the following reactions will have a positive value or a negative value. Calculations are not necessary! (a) 2 CO (g) + 2 Cl2 (g) → 2 COCl2 (g) (b) 2 CO2 (g) → 2 CO (g) + O2 (g) (c) SiCl4 (g) + 2 H2O (g) → 4 HCl (g) + SiO2 (s, quartz)
(A) Predict whether the change in entropy (ΔS) is positive, negative or near zero for the following processes at 298K. Provide a molecular level explanation or justification for your prediction. (B) Calculate the change in entropy (ΔS) for the following processes at 298K. i. H2O (s) → H2O (l), melting of ice. ii. Formation reaction for steam (water vapor, H2O (g)). iii. C3H8 (l) → C3H8 (aq), Liquid propane going to aqueous propane. iv. The hydrolysis of the dipeptide glycylglycine...
3. Predict the sign (positive or negative) on the entropy change for each of these reactions. (a) 2 SO2 (g) + O2 (g) → 2 SO3 (g) Negative (b) 2 NH3 (g) → N2 (g) + 3 H2 (g) (c) CO (g) + 2 H2 (g) → CH3OH (1) 4. For the reaction: 2NO2 (g) + N204 (g) at 298 K, The value of AH° and AS™ are -58.03 kJ and -176.6J/K, respectively. (a) What is the value of AG°...
3) Predict whether the change in entropy is positive, negative, or zero for each of the following reactions at 298 K, and explain your reasoning (2 pts each. 8 pts total): 1.4 Fe(s) + 3 O2(g) → 2 Fe:O:(s) b. O(g) + ( ) → O.(g) NH,Cl(s) » NH(g) + HCl(g) d. Hz(g) + Cl:(g) → 2 HCI c.
(A) Predict whether the change in entropy (ΔS) is positive, negative or near zero for the following processes at 298K. Provide a molecular level explanation or justification for your prediction . (B) Now calculate the change in entropy (ΔS) for the following processes at 298K . Write a brief explanation on how your predicted vs. calculated results compare. i. H2O (s) → H2O (l), melting of ice. ii. Formation reaction for steam (water vapor, H2O (g)). iii. C3H8 (l) →...
A) Predict whether the change in entropy (ΔS) is positive, negative or near zero for the following processes at 298K. Provide a molecular level explanation or justification for your prediction . (B) Now calculate the change in entropy (ΔS) for the following processes at 298K . Write a brief explanation on how your predicted vs. calculated results compare. i. H2O (s) → H2O (l), melting of ice. ii. Formation reaction for steam (water vapor, H2O (g)). iii. C3H8 (l) →...
Predict the sign (positive or negative) on the entropy change for each of these reactions. (a) 2 50, (e) + O2(g) → 250 (6) (b) 2 NH; (6) ► N2 (€) + 3 H2 (8) (c) CO (B) + 2 H2(g) → CH3OH (0)