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.
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
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?
0. When potassium is added to water, the following reaction takes place readily. ArH° < 0 K(s) + H2O(8) –→ KOH(aq) + ½ H2(g) What can be said about this reaction (Free energy sign, exo- or endothermic, how spontaneity changes with temperature?)
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
5 ml of a 0.2 M NH3 solution are added to 5 ml of a 0.1 M NH4Cl solution (Kb for NH3 is = 1.8 × 10-5). Calculate: a) the pH of the resulting solution; b) the ΔpH due to the addition of 5 ml of a 0.01 M HNO3 solution to the solution resulting from part a); c) the ΔpH due to the addition of 10 ml of water to the solution resulting from part a)
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)
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
An increase in water temperature is observed when 1.97 g of NaOH is added. The enthalpy change for this reaction is -2.19 kJ. Calculate the AH°scln for NaOH. The AH°scln for NAOH is -44.5 kJ/mol. The AH° soln for NaOH is -26.3 kJ/mol. O The AH°scln for NaOH is -72.4 kJ/mol.

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