In which of the following scenarios is no change in the internal energy of the system possible? O q<0, w=0 O q<0, w > 0 O q = 0, w > 0 O q<0, w < 0 O q> 0, w > 0

Part C The standard enthalpy change and standard entropy change for the reaction are: 4H = -883.2 kJ mol and 4,5° = -114.0 JK mot", respectively. Which of the following statements is true? O The reaction is only spontaneous at high temperatures. O The reaction is spontaneous at low temperatures. O The reaction is non-spontaneous at all temperatures. O The reaction spontaneous at all temperatures.

Consider this reaction: C6H12O6 + 602 à 6CO2 + 6H₂O. What is the standard enthalpy AH°rxn given the standard molar enthalpies of the substances below? Substance C6H12O6 02 CO₂ H₂O AHᵒf (kJ/mol) -1274.4 0 -393.45 -241.8

Under what conditions does q, the heat evolved or absorbed by the system in a physical or chemical process, equal the change in enthalpy of the system? 1. When q = 0. 2. When w = 0. 3. When w = -PAV. O 1, 2, and 3 O 1 only 3 only O 2 only O 2 and 3

5. Use standard heats of formation and the following equation to determine the enthalpy of formation of C₂H() ΔΗ, = -3127 kJ 2C₂H6(g) +70₂(g) ⇒ 4CO2(g) + 6H₂O)