Chapter 18.2, Problem 1PPB

Practice ProblemBUILD

In each of the following reactions, there is one species for which the standard entropy is not listed in Appendix 2. In each case, using the values that are in Appendix 2 and the that is given, determine the value of the missing standard entropy at 25 $°$ C:

$\begin{array}{l}\text{(a)}\\ \text{K(s) }\to \text{ K(}l\text{), }\Delta S_{\text{rxn}}^{°}=7.9\text{J/K}\cdot \text{mol,}\\ \text{(b)}\\ {\text{2S(rhombic) + Cl}}_{\text{2}}\text{(}g\text{) }\to \text{ S2Cl2(g)}\text{. }\Delta S_{\text{rxn}}^{°}=44.74\text{ J/K}\cdot \text{mol,}\\ \text{(c)}\\ {\text{O}}_{\text{2}}\text{(}g{\text{) + 2MgF}}_{\text{2}}\text{(}s\text{) }\to \text{ 2MgO(}s{\text{) + 2F}}_{\text{2}}\text{(}g\text{)}\text{. }\Delta S_{\text{rxn}}^{°}=140.76\text{ J/K }\cdot \text{ mol}\text{.}\end{array}$