2. Appropriately combine the measured enthalpies of reactions (2) and (3) to predict AH, for the followin reaction: Reaction (1): CaCO, + H,0 Ca(OH), 9 + CO. AH, = . 3 (s) (1) 2 (s) 2 (g)

5.67 (a) What is meant by the term standard conditions with zec erence to enthalpy changes? (b) What is meant by the ferm enthalpy of formation? (c) What is meant by the term standard enthalpy of formation? os gniwollol ori 19bian T0

Using the information provided along with an understanding of Hess's Law, determine the enthalpy of reaction for the unknown reaction. AFels) + 3Sn0,(s) → 2Fe,0,(s) +3Sn(s) 2Fe(s) +0, (s) - Fe;0,(s) A,H = -824.2 k) Sn{s) + 0,(g) - Sn02(s) AyH=-580.7 k/

15. Using the standard enthalpies of formation for the chemicals involved, calculate the enthalpy change for the following reaction. (Note: Show the math clearly and provide units in your setup) (AH; Values in kJ/mol are as follows: NO, +32, H,0 -286, HNO3 -207, NO +90) 3NO2(8) + H,Oy O 2HNO3(aq) + NO(g) (g),

Calculate AE and determine whether the process is endothermic or exothermic for the following cases: (1) q = 0.123 kJ and w = - 230 J (2) A system releases 66.1 kJ of heat to its surroundings while the surroundings to 44.0 kJ of work on the system.

Given the following enthalpy change values for the reactions below: A + B → 2C; AH = -485.1 kJ mol-¹ C + 2D + E +F; AH = 251.4 kJ mol-¹ ½E + G +H; AH = 471.1 kJ mol-¹ Calculate A,H for the following reaction (in kJ mol-¹) using Hess's Law: A + B + 4D + 4G → 4H + 2F Answer:

Sulfur dioxide, SO, (g), can react with oxygen to produce sulfur trioxide, SO, (g), by the reaction 2 SO, (g) + 0,(g) → 2 SO,(g) The standard enthalpies of formation for SO,(g) and SO, (g) are AH; [SO,() = -296.8 kJ/mol AH; SO,( = -395.7 kJ/mol Calculate the amount of energy in the form of heat that is produced when a volume of 4.10 L of SO, (g) is converted to 4.10 L of SO, (g) according to this process at a constant pressure and temperature of 1.00 bar and 25.0 °C. Assume ideal gas behavior. kJ AL = 18.249 incbrcect