Answered: . The reaction Si(s) + 2 H2(g) ⇌…

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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1. The reaction Si(s) + 2 H2(g) ⇌ SiH4(g) is spontaneous at 298 K. The standard enthalpy of reaction ΔrH° = -61.9 kJ/mol and standard entropy of reaction ΔrS° = -76.7 J/K mol. At what temperature does the reaction cease to be spontaneous? 2. The standard cell potential for the Daniell cell, Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s) is +1.102 V at 298 K and +1.095 V at 363 K. Calculate the standard reaction entropy. 3. The pKa of hydrocyanic acid, HCN, is 9.218 at 293 K. Calculate the conductivity of an aqueous solution of perchloric acid, of concentration 0.015 mol/dm^3, given that the ionic conductivity of H+ ions is 35 mS m^2/mol and of CN- ions is 82 mS m^2/mol.

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