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ezto.mheducation.com Chegg.com Your question was answered abbylo Mail Abigail R Looper Outlook Chapter 14 X Question 8 (of 17) 10.000 points 1 out of 3 attempts Assistance Be sure to answer all parts. Check My Work Take all the thermodynamic data from your textbook. Assume the data do not vary with View H temperature View Qu (a) Calculate AS univ for the reaction H202(l) H202(g) at 162.0oC. Enter your answer in the box provided. Qu n Help Report a Problem JIK mol (b) Is the reaction spontaneous, nonspontaneous, or an equilibrium process? Select the best single answer. spontaneous nonspontaneous o an equilibrium process (c) The reaction NH30g) t HCl(g) NH4ci(s) is spontaneous in the forward direction at room temperature. Determine the temperature at which it is no longer spontaneous in the eBook & Resources References Difficulty: Hard Multipart Answer Section: 18 Chapter 14 Chap instructions l help 4 Save & Exit Submit

Explanation / Answer

H2O2(l) -----> H2O2(g)   Delta S univ = (-DHf/T) + DS

Hf1 = -136.31 kJ/mol for the gas phase S1 = 109.6 J/molK

Hf2 = -187.78 kJ/mol for the liquid phase S2 = 232.6 J/molK

DS = 109.6 - 232.6 = -123 J/molK or 0.123 kJ/molK

DHf = -136.31 + 187.78 = 51.47 kJ/mol

DSuniv = -(51.47 / 162 + 273) - 0.123 = -0.241 kJ/molK

According to the value of DHr, the reaction would be nonspontaneus.

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