Consider the decomposition of liquid benzene, C6H6(l), to gaseous acetylene, C2H2(g): ⅓C6H6(l) ---> C2H2(l)  DH = +210 kJ 1. What is the enthalpy change for the reverse reaction? 2. What is DH for the decomposition of 1 mol of benzene to acetylene? 3. Which is more likely to be thermodynamically favored, the forward or the reverse reaction?

Calculate the enthalpy, AH for this reaction in kJ, given the data below to ONE DECIMAL PLACE. DO NOT INCLUDE UNITS IN YOUR ANSWER. |20(s) + H2(g) ---> C2H2(g) AH° = ??? kJ Given the following thermochemical equations: C2H2(g) + 5½O2{g) ---> 2CO2(g) + H2O(e) AH° = -1,071.2kJ C(s) + O2(g) ---> CO2(g) AH° = -375.6 kJ H2(g) + ½O2(g) ---> H2O(e) AH° = -285.8 kJ

10. Calculate the standard enthalpy of formation of N₂O5 from the following data: kJ mol kJ 2NO(g) + O₂(g) →2NO₂(g) 4NO2(g) + O₂(g)→2N205(g) N₂(g) + O₂(g) →2NO(g) 4,H☺ = -114.1 = -110.2- 'mol kJ mol AH AH = + 180.5,

Sketch an enthalpy diagram for the combustion of cyclopropane, C3H6 (g).

2.

For the reaction below (which will be labeled reaction A), the reaction enthalpy is unknown:                                                   2 B    + 3 H2    B2H6    HA  = ? Use the following thermochemical data to calculate the reaction enthalpy ΔHA: Reaction 1:       4 B + 3 O2 → 2 B2O3                               ΔH1 = –2509 kJ Reaction 2:       2 H2 + O2 → 2 H2O                          ΔH2 = –572 kJ Reaction 3:       B2H6 + 3 O2 → B2O3 + 3 H2O   ΔH3 = –2,159 kJ Calculate the enthalpy of reaction A (in kJ) and enter the numerical value in the answer box. Do not write units in the answer box. Clearly show on a paper how each reaction can be combined to equal reaction A  (multiply or reverse  each of the above reactions).complete work must be uploaded

THERMODYNAMICS: A 1.09 g sample of acetic acid (HC2H2O2) was burned in excess oxygen in a bomb calorimeter. The calorimeter, which alone had a heat capacity of 2.67 KJ°C. contained 7g of water. The temperature of the calorimeter and its contents increased from 24.13°C to 27.95°C. What is AH (in kJ) for the combustion per 1.00 mol of acetic acid? MW of acetic acid is 60 gimol. (Round off the final answer to ONE decimal place. Do not include the unit.)

4) Consider the thermochemical equation below. What mass of HgO must decompose to consume 400.0 kJ of heat? 2 HgO (s) → 2 Hg (1)+ O2(g) AH°rxn =+ 181.4 kJ (1) 5) Write the standard formation reaction for KAI(SO4)2(s). (1) 3 CO2 (g). (1) -393.5 kJ/mol 2 Cr (s) + 3 CO (ag) -110.5 kJ/mol Cr2O3 (s) 6) Consider the reaction 0.0 kJ/mol AH°f = -1139.7 kJ/mol Calculate AH°rxn.

An ideal gas sealed in a rigid 3.13-L cylinder, initially at pressure Pi=12.70 atm, is cooled until the pressure in the cylinder is Pf=1.18 atm. What is the enthalpy change for this process?What is the change in internal energy for this process?

55. Does the standard enthalpy of formation of H2O(g) differ from ΔH° for the reaction 2H2(g)+O2(g)⟶2H2O(g)?