
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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The enthalpy for a certain process is 146.4 kJ/mol and the entropy for the process is 463.6 J/K. At what temperature (in K) will the process become spontaneous?
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- All spontaneous changes cause an increase in the entropy of the universe. True Falsearrow_forwardRead the descriptions of physical or chemical changes in the table below. Then decide whether the change will be spontaneous, if you can. Change A gas condenses to a liquid, neither absorbing nor releasing heat. An exothermic chemical reaction between a solid and a liquid results in gaseous products. Two liquids mix, neither absorbing nor releasing heat. Is this change spontaneous? Yes. No. Can't decide with information given. ○ Yes. ○ No. Can't decide with information given. Yes. No. ○ Can't decide with information given.arrow_forwardWhat is the entropy change when 1.90 moles of CHCl3 condenses at 61.0 °C? [AH(vap) = 29.6 kJ/ mol at 61.0 °C]arrow_forward
- For a given reaction, dH = 32 kJ/mol and dS = 117 J/mol. At approximately what temperature would this reaction become spontaneous?arrow_forwardFor silicon, Si, the heat of fusion at its normal melting point of 1410 °C is 46.4 kJ/mol. The entropy change when 2.12 moles of liquid Si freezes at 1410 °C, 1 atm is J/K.arrow_forwardFrom the values of ΔH and ΔS calculate the minimum temperature at which each reaction will become spontaneous. Enter "None" if the reaction is not spontaneous at any temperature. ΔH = -389 kJ/mol, ΔS = 27.8 J/K · molarrow_forward
- Consider entropy and its role in determining if chemical and physical processes are spontaneous. For any process to be spontaneous, what must happen to the entropy of the universe during that process? Acetone will spontaneously vaporize when coming in contact with your skin even though acetone has a much higher boiling point. Explain how this occurs in light of your answer to part (a).arrow_forwardCalculate the entropy change of 63.4 g of water that freezes into ice at 273.15 K. AHfus for water is 6.01 kJ/mol. J/Karrow_forwardCompare what will happen to the entropy of the whole system in the following two scenarios: A) if the oil molecules are all clumped together and the clump is surrounded by water and B) if the oil molecules are spread out evenly throughout the water, each individual oil molecule surrounded by water?arrow_forward
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