%3Cp%3E%3Cspan%20id%3D%22yui_3_11_0_24_1396882420704_53%22%20class%3D%0A%22repla
ID: 828352 • Letter: #
Question
%3Cp%3E%3Cspan%20id%3D%22yui_3_11_0_24_1396882420704_53%22%20class%3D%0A%22replace-insert%20done%22%3E%3Cspan%20class%3D%22type-specific%22%3E%3Cspan%3E%3Cspan%20id%3D%0A%22MathJax-Element-10-Frame%22%20class%3D%22MathJax%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-226%22%20class%3D%22math%22%3E%3Cspan%20class%3D%22c3%22%3E%3Cspan%20class%3D%0A%22c2%22%3E%3Cspan%20id%3D%22MathJax-Span-227%22%20class%3D%22mrow%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-228%22%20class%3D%22mi%20c1%22%3EC%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-229%22%20class%3D%22mi%20c1%22%3Ea%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-230%22%20class%3D%0A%22mi%20c1%22%3EO%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%0Acan%20be%20used%20as%20a%20drying%20agent.%20One%20such%20application%20occurs%20when%0Awater%20is%20added%20to%20dry%20concrete%20or%20cement.%20The%20reaction%20that%20occurs%0Ais%3C%2Fp%3E%0A%3Cp%20class%3D%22c17%22%20id%3D%22yui_3_11_0_24_1396882420704_60%22%3E%3Cspan%20id%3D%0A%22yui_3_11_0_24_1396882420704_59%22%20class%3D%0A%22replace-insert%20done%22%3E%3Cspan%20class%3D%22type-specific%22%3E%3Cspan%3E%3Cspan%20id%3D%0A%22MathJax-Element-11-Frame%22%20class%3D%22MathJax%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-231%22%20class%3D%22math%22%3E%3Cspan%20class%3D%22c16%22%3E%3Cspan%20class%3D%0A%22c15%22%3E%3Cspan%20id%3D%22MathJax-Span-232%22%20class%3D%22mrow%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-233%22%20class%3D%22mi%20c1%22%3EC%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-234%22%20class%3D%22mi%20c1%22%3Ea%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-235%22%20class%3D%22mi%20c1%22%3EO%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-236%22%20class%3D%22texatom%22%3E%3Cspan%20id%3D%22MathJax-Span-237%22%0Aclass%3D%22mrow%22%3E%3Cspan%20id%3D%22MathJax-Span-238%22%20class%3D%0A%22mo%20c1%22%3E(%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-239%22%20class%3D%0A%22mi%20c1%22%3Es%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-240%22%20class%3D%0A%22mo%20c1%22%3E)%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-241%22%20class%3D%0A%22mo%20c4%22%3E%2B%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-242%22%20class%3D%0A%22msubsup%20c9%22%3E%3Cspan%20class%3D%22c8%22%3E%3Cspan%20class%3D%22c5%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-243%22%20class%3D%22mi%20c1%22%3EH%3C%2Fspan%3E%3C%2Fspan%3E%3Cspan%20class%3D%0A%22c7%22%3E%3Cspan%20id%3D%22MathJax-Span-244%22%20class%3D%0A%22mn%20c6%22%3E2%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-245%22%0Aclass%3D%22mi%20c1%22%3EO%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-246%22%20class%3D%0A%22texatom%22%3E%3Cspan%20id%3D%22MathJax-Span-247%22%20class%3D%22mrow%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-248%22%20class%3D%22mo%20c1%22%3E(%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-249%22%20class%3D%22mi%20c1%22%3El%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-250%22%20class%3D%22mo%20c1%22%3E)%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-251%22%20class%3D%22mo%20c10%22%3E%3F%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-252%22%20class%3D%22mi%20c11%22%3EC%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-253%22%20class%3D%22mi%20c1%22%3Ea%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-254%22%20class%3D%22mo%20c1%22%3E(%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-255%22%20class%3D%22mi%20c1%22%3EO%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-256%22%20class%3D%22mi%20c1%22%3EH%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-257%22%20class%3D%22msubsup%22%3E%3Cspan%20class%3D%22c14%22%3E%3Cspan%20class%3D%0A%22c12%22%3E%3Cspan%20id%3D%22MathJax-Span-258%22%20class%3D%0A%22mo%20c1%22%3E)%3C%2Fspan%3E%3C%2Fspan%3E%3Cspan%20class%3D%22c13%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-259%22%20class%3D%0A%22mn%20c6%22%3E2%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3Cspan%20id%3D%22MathJax-Span-260%22%0Aclass%3D%22texatom%22%3E%3Cspan%20id%3D%22MathJax-Span-261%22%20class%3D%22mrow%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-262%22%20class%3D%22mo%20c1%22%3E(%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-263%22%20class%3D%22mi%20c1%22%3Es%3C%2Fspan%3E%3Cspan%20id%3D%0A%22MathJax-Span-264%22%20class%3D%0A%22mo%20c1%22%3E)%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fspan%3E%3C%2Fp%3E%0AThe%20product%20is%20commonly%20called%20slaked%20lime.%0A%3Cp%20id%3D%22yui_3_11_0_24_1396882420704_64%22%3EAssuming%20the%20commonly%20used%0Astandard-state%20temperature%20of%2025%3Cspan%20id%3D%0A%22yui_3_11_0_24_1396882420704_63%22%20class%3D%0A%22replace-insert%20done%22%3E%3Cspan%20class%3D%22type-specific%22%3E%3Cspan%3E%3Cspan%20id%3D%0A%22MathJax-Element-12-Frame%22%20class%3D%22MathJax%22%3E%3Cspan%20id%3D%0A%22MathJax-Span-265%22%20class%3D%22math%22%3E%3Cspan%20class%3D%22c22%22%3E%3Cspan%20class%3D%0A%22c21%22%3E%3Cspan%20id%3D%22MathJax-Span-266%22%20class%3D%22mrow%22%3E%3Cspan%20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/ Answer
Having this table in your mind
Substance.....S in J/(K*mol)......Delta H f in kJ/mol
CaO (s).......39.9.................... -635.1
H2O(l).........69.9...................... -285.8
Ca(OH)2(s)..83.4.................... -986.1
CaO(s) + H2O(l) <-->Ca(OH)2(s)
Tsurr = 0 deg. C = 273 K (Standard temperature)
?S_surr = -?H/Tsurr = -(-986.1 - 635.1 - 285.8)/273
?S_surr = 238.83 J/K
?S_total = 238.83 - 26.4
?S_total = 212.43 J/K
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