Concept explainers
Interpretation:
The entropy changes associated with the sublimation of iodine has to be found.
Concept Introduction:
Entropy is a
Where,
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CHEMISTRY: ATOMS FIRST ALEKS CODE
- The normal melting point of benzene, C6H6, is 5.5 C. For the process of melting, what is the sign of each of the following? (a) rH (b) rS (c) rG at 5.5 C (d) rSG at 0.0 C (e) rG at 25.0 Carrow_forward9.83 A student performing a calorimetry experiment combined 100.0 mL of 0.50 M HCl and 100.0 mL of 0.50 M NaOH in a coffee cup calorimeter. Both solutions were initially at 20.0°C, but when the two were mixed, the temperature rose to 23.2°C. (a) Suppose the experiment is repeated in the same calorimeter but this time using 200 mL of 0.50 M HCl and 200.0 mL of 0.50 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why? (b) Suppose that the experiment is repeated once again in the same calorimeter, this time using 100 mL of 1.00 M HCl and 100.0 mL of 1.00 M NaOH. Will the T observed he greater than, less than, or equal to that in the first experiment, and why?arrow_forwardPredict the sign of S for each of the following and explain. a. the evaporation of alcohol b. the freezing of water c. compressing an ideal gas at constant temperature d. dissolving NaCl in waterarrow_forward
- Q2.) For a particular reaction, ΔH = -32 kJ and ΔS = -90 J/K . Assume that ΔH and ΔS do not vary with temperature. 1. At what temperature will the reaction have ΔG=0? (Express your answer using two significant figures.) 2. If T is increased from that in part A, will the reaction be spontaneous or nonspontaneous?arrow_forward4.36) Predict the sign of ΔH, ΔS, and ΔG of the system for the following processes at 1 atm: (a) ammonia melts at -60 C, (b) ammonia melts at -77.7 C , and (c) ammonia melts at -100 C. (The normal melting point of ammonia is -77.7 C.)arrow_forwardThe normal melting point of benzene, C6H6, is 5.5 °C. For the process of melting, what is the sign of each ofthe following, and why?∆H° , ∆S°, ∆G° at 5.5 °C, ∆G° at 0.0 °C, ∆G° at 25.0 °C.arrow_forward
- 4,At constant pressure, the sign of q for the process C3H8(g) => C3H8(l) is____, because______ Group of answer choices A, positive, the process is exothermic B, no correct answer C, negative, the process is endothermic D, negative, the process is exothermic E, positive, the process is endothermic 5,If 9.00 mol of hydrogen gas completely reacted with 3.000 mol of nitrogen gas at constant pressure, releasing 277 kJ of heat, which of the following thermochemical equations is correct? Group of answer choices A, 3H2(g) + N2(g) => 2NH3(g); ΔH° = +92.33 kJ B, 3H2(g) + N2(g) => 2NH3(g); ΔH° = +831kJ C, 3H2(g) + N2(g) => 2NH3(g); ΔH° = +277 kJ D, 3H2(g) + N2(g) => 2NH3(g); ΔH° = –92.3 kJ E, 3H2(g) + N2(g) => 2NH3(g); ΔH° = –277 kJarrow_forwardLiquid water vaporizes spontaneously at 25ºC. What is the sign of ΔSuniv? Decide on the relative sizes of ΔSsys and ΔSsurr and give their signs.arrow_forward4.36) Predict the signs of ΔH, ΔS, and ΔG of the system for the following processes at 1 atm: (a) ammonia melts at -60 C, (b) ammonia melts at -77.7 C, and (c) ammonia melts at -100 C. (The normal melting point of ammonia is -77.7 C.)arrow_forward
- The value of △G° at 100.0 °C for the formation of calcium chloride from its constituent elements: Ca (s) + Cl2 (g) → CaCl2 (s) is __________ kJ/mol. At 25.0 °C for this reaction, △H° is -795.8 kJ/mol, △G° is -748.1 kJ/mol, and ΔS° is -159.8 J/K.arrow_forwardNitrogen dioxide, NO2, an air pollutant, dissolves in rainwater to form a dilute solution of nitric acid. The equation for the reaction 3NO2 (g) + H2O (L) - - - > 2HNO3 (L) + NO CALCULATE THE change of S0 FOR THIS REACTION IN J/Karrow_forwardThe value of ΔS° for the formation of calcium chloride from its constituent elements, Ca (s) + Cl2 (g) → CaCl2 (s) is __________ J/K.arrow_forward
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