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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Sodium reacts violently with water according to the equation: 2 Na(s) + 2 H2O) → 2 NaOH(aq) + H2g) The resulting solution has a higher temperature after the reaction. What are the signs of AH and AS° for this reaction? AH° is positive and AS° is negative. AH° is negative and AS° is positive. AH° is negative and AS° is negative. AH° is positive and AS° is positive.
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
Sodium reacts violently with water according to the equation below. 2 Na(s) + 2 H₂O → 2 NaOH(aq) + H₂(g) The resulting solution has a higher temperature than the water prior to the addition of sodium. What is the sign of AH° for this reaction? And is the reaction endothermic or exothermic? Select one: AH° is negative and the reaction is endothermic AH° is negative and the reaction is exothermic AH° is positive and the reaction is exothermic AH° is positive and the reaction is endothermic
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
2 K(s) + 2 H2O(l) → 2 KOH(aq) + H2(g) AH-393 kJ/molræn When 3.9 g of K(s) is added to 200. mL of water at 25°C in a calorimeter, all the K(s) reacts with the water as represented by the equation above. Which of the following is true about the pH of the water after the reaction is complete? (A) pH 7 The pH of the water cannot be determined without additional information.
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)?
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?
Aqueous solutions of calcium chloride and sodium hydroxide react to form solid calcium hydroxide. The balanced net ionic equation is: A) Ca+2(aq) + 2OH-(aq) + 2Na+(aq) + 2Cl-(aq) → Ca(OH)2(s) B) Ca+2(aq) + 2OH-(aq) + Na+(aq) + Cl-(aq) → Ca(OH)2(s) C) Ca+2(aq) + 2OH-(aq) → Ca(OH)2(s) D) CaCl2(aq) + 2NaOH(aq) → CaOH(s) + NaCl(aq) E) CaCl2(aq) + 2NaOH(aq) → Ca(OH)2(s) + 2NaCl(aq)
Calculate AG° at 605 K for H2O(g) + 1/2 O2(g) H2O2(g) using the following data: H2(g) +O2(g) S H2O2(g) K = 8.9 x 106 at 605 K 2H2(g) + O2(g) = 2H20(g) K = 2.0 x 10° at 605 K AG° kJ/mol
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

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