H' (aq) + OH-(aq) → H2O(1) NH3, c sure of the heat of neutralization is -56.2 kJ mol-1. What is the final temperature of the mixed solution? 3.39 When 1.034 g of naphthalene (C1oHs) are com- this rea 3.46 T pletely burned in a constant-volume bomb calorimeter acid a at 298 K, 41.56 kJ of heat is evolved. Calculate the values of A, U and A,H for the reaction. water respe isome Thermochemistry 3.40 Consider the following reaction: 2CH3OH(I) + 3O2(g) → 4H20(1) + 2CO2 (g) A,Ho-1452.8 kJ mol-1 What is the value of Δ,Ho if (a) the equation is multi- plied throughout by 2, (b) the direction of the reaction is reversed so that the products become the reactants and vice versa, and (c) water vapor instead of liquid water is the product? 3.41 Which of the following standard enthalpy of for- mation values is not zero at 25°C? Na(s), Ne(g), CH4(9), S8 (s), Hg(), H(g). 3.42 The standard enthalpies of formation of ions in aqueous solution are obtained by arbitrarily assigning a value of zero to H+ ions; that is, ΔΗ'H+(aq)]-0. 3.4 an 3 (a) For the following reaction, HCl (g)--H+ (aq) + Cl-(aq) A,H' -74.9 kJ mol-1

H' (aq) + OH-(aq) → H2O(1) NH3, c sure of the heat of neutralization is -56.2 kJ mol-1. What is the final temperature of the mixed solution? 3.39 When 1.034 g of naphthalene (C1oHs) are com- this rea 3.46 T pletely burned in a constant-volume bomb calorimeter acid a at 298 K, 41.56 kJ of heat is evolved. Calculate the values of A, U and A,H for the reaction. water respe isome Thermochemistry 3.40 Consider the following reaction: 2CH3OH(I) + 3O2(g) → 4H20(1) + 2CO2 (g) A,Ho-1452.8 kJ mol-1 What is the value of Δ,Ho if (a) the equation is multi- plied throughout by 2, (b) the direction of the reaction is reversed so that the products become the reactants and vice versa, and (c) water vapor instead of liquid water is the product? 3.41 Which of the following standard enthalpy of for- mation values is not zero at 25°C? Na(s), Ne(g), CH4(9), S8 (s), Hg(), H(g). 3.42 The standard enthalpies of formation of ions in aqueous solution are obtained by arbitrarily assigning a value of zero to H+ ions; that is, ΔΗ'H+(aq)]-0. 3.4 an 3 (a) For the following reaction, HCl (g)--H+ (aq) + Cl-(aq) A,H' -74.9 kJ mol-1

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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