Unit 8_Nazarli_Heydar_62115076

CHEM 154: Chemistry for Engineering Unit 8: Entropy and the Second Law Name:_______________________________________________________ Student ID: _________________________________________________ 2023W 3 5. Calculate ΔS ◦ for the formation of 1 mol of solid Fe 2 O 3 (rust!) from its elements given the following information: 6. Consider the reaction: N 2 O 4 (g)  2 NO 2 (g) Δ H ° = 58.03 kJ Δ S ° = 176.7 J K -1 a) Calculate the temperature at which the reaction is at equilibrium under standard conditions (assume Δ H ° and ΔS° do NOT vary with temperature). b) Explain what happens to the spontaneity of the reaction when the temperature is above or below that calculated in part a). Species S m ◦ (J mol -1 K -1 ) Fe(s) 27.28 O 2 (g) 205.10 Fe 2 O 3 (s) 87.40