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Published byYuliani Kusnadi Modified over 6 years ago
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Announcements Lon-Capa: 5th HW assignment due Friday 10/21 by 5 pm.
Lon-Capa: 4th Quiz due Sunday, 1023 by 10 pm. Opens Friday 10/21 at 5 pm. Exam 2 is Tuesday, October 25; rooms the same as Exam 1; equation sheet posted online. Office hours Tuesday: 1 pm, not 10 am
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A Question to Consider Calculate S and Suniv when 50.0 g of ice at 0C is dropped into g of water at 75C in a perfectly insulated vessel and briefly discuss these numbers to show that all of the ice will indeed spontaneously melt. Hfusion for ice is 6.02 kJ/mol at 0C and Cp for water is 75.3 J/Kmol Assume Cp is constant over the temperature range in question.
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The meaning of Grxn At constant temperature and pressure the sign indicates the spontaneity of the reaction. Grxn < 0 means spontaneous Grxn > 0 means not spontaneous (or spontaneous in the opposite direction) If we change the temperature we can change the sign of Grxn The magnitude of Grxn tells us the relative extent of the reaction (recall that K does too!) If we change the temperature we can change the magnitude of Grxn.
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Clicker Question Consider the spontaneous reaction:
2KClO3(s) 2KCl(s) + 3O2(g) Is the reaction endothermic or exothermic? a) Endothermic b) Exothermic c) More information is needed. d) I do not know how to answer this question.
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