Exam 4: Thermodynamics

Calculate the lattice enthalpy of silver chloride from the following data. Enthalpy of formation of Ag(g): +284 kJ.mol^-1 First ionization energy of Ag(g): +731 kJ.mol^-1 Enthalpy of formation of Cl(g): +122 kJ.mol^-1 Electron affinity of Cl(g): +349 ( $\Delta$ H = -349) kJ.mol^-1 Enthalpy of formation of AgCl(s): -127 kJ.mol^-1

Which of the following statements about ion formation is true?

If the standard enthalpy of combustion of octane, C₈H₁₈(l),at 298 K is -5471 kJ.mol^-1 calculate the standard enthalpy of formation of octane.The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ.mol^-1 ,respectively.

If 2.00 mol of an ideal gas at 300 K and 3.00 atm expands from 6.00 L to 18.00 L and has a final pressure of 1.20 atm, isothermally and reversibly, Which of the following is correct?

Calculate the standard enthalpy of formation of bicyco[1.1.0]butane (shown below) given the standard enthalpies of formation of C(g)And H(g),717 and 218 kJ.mol^-1 ,Respectively,And the average C-H and C-C bond enthalpies,412 and 348 kJ.mol^-1,Respectively.

The combustion of 1 mole of octane, C₈H₁₈(l),To produce carbon dioxide and liquid water has $\Delta$ H_r = -5471 kJ.mol^-1 at 298 K.What is the change in internal energy for this reaction?

A CD player and its battery together do 500 kJ of work .The battery also releases 250 kJ of energy as heat and the CD player releases 50 kJ as heat due to friction from spinning.What is the change in internal energy of the system, With the system regarded as the battery and CD player together?

How much work is done by a person of mass 185 kg who climbs a ladder to the top of his house, a total of 15.0 m?

Consider the reaction Cl₂(g) $\rightarrow$ 2Cl(g) Which of the following statement regarding this reaction is true?

Calculate the enthalpy change that occurs when 1.00 kg of acetone condenses at its boiling point (329.4 K) .The standard enthalpy of vaporization of acetone is29.1 kJ.mol^-1.

What is the total motional contribution to the molar internal energy of gaseous H₂O at 25 ^$\circ$ C?

A piece of a newly synthesized material of mass 12.0 g at 88.0 ^$\omicron$ C is placed in a calorimeter containing 100.0 g of water at 20.0 ^$\omicron$ C .If the final temperature of the system is 24.0 ^$\omicron$ C,What is the specific heat capacity of this material?

Which of the following is not a state function?

Which of the following would probably have a positive $\Delta$ S value?

A reaction known to release 4.00 kJ of heat takes place in a calorimeter containing 0.200 L of solution and the temperature rose by 6.14 ^$\omicron$ C .When 200 mL of hydrochloric acid was added to a small piece of calcium carbonate in the same calorimeter,The temperature rose by 4.25 ^$\omicron$ C.What is the heat output for this reaction?

What mass of ethanol, C₂H₅OH(l),Must be burned to supply 500 kJ of heat? The standard enthalpy of combustion of ethanol at 298 K is -1368 kJ.mol^-1

What type of process is the formation of solid magnesium chloride from a gas of its ions?

The combustion of 1 mole of ethanol, C₂H₅OH(l),To produce carbon dioxide and gaseous water has $\Delta$ H_r = -1235 kJ.mol^-1 at 298 K.What is the change in internal energy for this reaction?

Which of the following statements is true?

How much heat is required to vaporize 50.0 g of water if the initial temperature of the water is 25.0 ^$\circ$ C and the water is heated to its boiling point, where it is converted to steam? The specific heat capacity of water is 4.18 J.( ^$\circ$ C)^-1g^-1 and the standard enthalpy of vaporization of water at its boiling point is 40.7 kJ.mol^-1.