Sodium reacts violently with water according to the equation: 2 Na(s) + 2 H2O(l) →2 NaOH(aq) + H2(g) The resulting solution has a higher temperature than the water prior to the addition of sodium. What are the signs of AH° and AS° for this reaction? C) AH° is positive and AS is negative. A) AH° is negative and AS° is negative. B) AH° is negative and AS° is positive. D) AH° is positive and AS is positive.

Sodium reacts violently with water according to the equation: 2 Na(s) + 2 H2O(l) →2 NaOH(aq) + H2(g) The resulting solution has a higher temperature than the water prior to the addition of sodium. What are the signs of AH° and AS° for this reaction? C) AH° is positive and AS is negative. A) AH° is negative and AS° is negative. B) AH° is negative and AS° is positive. D) AH° is positive and AS is positive.

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter16: Thermodynamics: Directionality Of Chemical Reactions

Section: Chapter Questions

Problem 91QRT: Actually, the carbon in CO2(g) is thermodynamically unstable with respect to the carbon in calcium...

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The neutralization of a strong acid and strong base has an enthalpy change, ∆H°, = -55.9 kJ/mol. The net ionic equation for this reaction is H⁺(aq) + OH⁻(aq) ⇌ H₂O(l) which is the reverse of the autoionization of water, and therefore ∆H° for the autoionization of water = +55.9 kJ/mol. Kw for the autoionization of water is 1.0 × 10⁻¹⁴ at 25°C. Distilled water has a [H⁺] = 1.0 × 10⁻⁷ M and a neutral pH of 7.0. Calculate the neutral pH of distilled water at 95°C.
Calculate ArH for the following reaction: CaO(s)+CO2(g)→CaCO3(s) Use the following reactions and given >ArH"s Ca(s)+CO2(g)+1/202(g) →CaCO3(s), ArH= -812.8 kJmol-1 2Ca(s)+02(g) →2CaO(s), ArH= -1269.8 kJmol-1 ArH=-177.9 kJ mol-1 ArH= 177.9 kJmol-1 ArH=327.9 kJmol-1 ArH=-327.9 kJmol-1
You may want to reference (Pages 187 - 190) Section 5.7 while completing this problem. Part A Using values from Appendix C, calculate the value of AH° for each of the following reactions. CaO(s)+ 2HC1(g)→CaCl (s) +H20(g) Express your answer using four significant figures. ΑΣφ ? AĦgm = kJ Submit Request Answer Part B 4FEO(s) + 02 (g)→2FE2O3 (s) Express your answer using four significant figures. ΔΗ kJ Submit Request Answer
Ammonia reacts with water in liquid ammonia solution according to the equation: NH3(g) + H2O ⇌ NH4+ + OH− The change in enthalpy for this reaction is 21 kJ/mol, and ΔS° = −303 J/(mol·K). What is the equilibrium constant for the reaction at the boiling point of liquid ammonia (−31°C)?
Consider the following reaction at 100.0 °C: Al(s) + NaOH(aq) + H20(l) ⇄ Na[Al(OH)4](aq) + H2(g) A) Write a balanced equilibrium quotient (Qc) for the following reaction. B) If the pressure of this reaction is increased, which direction will the equilibrium shift? Why?
Consider the ionization of nitrous acid at 25 °C: HNO2(aq) + H2O(l)H3O+(aq) + NO2–(aq) ΔG° = 19.1 kJ·mol–1What is the value of K for this equilibrium? 2.2 2.0×10–7 2.2×103 4.5×10–4
a) For the reaction given in Part A, how much heat is absorbed when 2.70 mol of AA reacts? (the image attached) b) For the reaction given in Part A, ΔS∘rxn is 39.0 J/K . What is the standard Gibbs free energy of the reaction, ΔG∘rxn?
What is the enthalpy change when silver chloride form from the ions in an aqueous solution? The net ionic equation is Ag+ (aq) + Cl– (aq) → AgCl (s) Delta H = ? a. + 163.78 kJ b. + 188.6 kJ c. – 188.6 kJ d. – 163.78 kJ e. – 65.5 kJ f. + 55.66 kJ g. none of these h. + 65.5 kJ i. – 55.66 kJ
Given: 2MNO(s) + O2(g) → 2MnO2(s) ArH = –269.6 kJ · mol-1
Given: 2 Ag+(aq) + Cu(s) ⟶ 2 Ag(s) + Cu2+(aq) ΔGo = -88.66 kJ/mol Calculate the value of Eo. ΔGo = -nFEo F = 96500 Express the answer to 3 sig. figs.
Item 8 Part A The value of AG" at 281.0 °C for the formation of phosphorous trichloride from its constituent elements, P2(e) + 3 Cla(e) → 2 PC (8) kJ/mol. At 25.0 °C for this reaction, AH° is –720.5 kJ/mol, AG° is 642.9 kJ/mol, and AS° is 263.7 J/K. is O 7.34 x 104 646.4 O -574.4 O - 866.6 O 1.45 x 10 Submit Request Answer

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