A,H negative (-) - When the reaction is product favored only at high temperature. A,S" positive (+) - When the reaction is product favored only at high temperature. A,H° positive (+) - When the reaction is product favored at all temperatures. positive (+) - When the reaction is product favored at all temperatures. Evaluate Incorrect

Using Hess's Law, determine AHf ° for CH4 based on the following reactions. It is known that when methane combustion takes place, 802.37 kJ / mol of heat is released Cgrafito + 2H2 CH4(g) CH4(9) + 202(9) CO29) + 2H2O) A¢H°= -802.37 kJ/mol Cgrafito + O2(g) CO2(g) A:H°= -393.5 kJ/mol 2H2(9) + O2(9) 2H2O(9) A¡H°= -241.83 kJ/mol

Consider the two reactions. 2 NH, (g) + 3 N,0(g) → 4N,(g) + 3 H,0(1) 4 NH, (g) + 3 0,(g) 2 N,(g) + 6 H,0(1) AH° = -1010 kJ AH° = 1531 kJ Using these two reactions, calculate and enter the enthalpy change for the reaction below. N, (g) + 0,(g) → N,0(g)

Identify each energy exchange as primarily heat or work, and determine whether the sign of the internal energy, ?E (?U) is positive or negative for the system.