ClONO2 is stable during the Antarctic winter, but quickly decomposes to form •ClO and •NO2 during the Antarctic summer. Explain why this is so.

Given the following reactions: Fe2O3(s) + 3 CO(g)→2 Fe(s) + 3 CO2(g); ΔH = −28.0kJ 3 Fe(s)+ 4 CO2(g) →4 CO(g) + Fe3O4(s); ΔH = +12.5 kJ the enthalpy of the reaction of Fe2O3 with CO 3 Fe2O3(s) + CO(g) → CO2(g) + 2 Fe3O4(s) is which of the following? -109 kJ -15.5 kJ +109 kJ -59.0 kJ

A styrofoam cup was analyzed in a lab and found to contain 92% by mass carbon. How much carbon can be found in a stack of polystyrene cups with a total mass of 569 grams?

Use the indicated average bond enthalpies to estimate the change in enthalpy, ΔHo, for the reaction between methane and iodine to produce iodomethane and hydrogen iodide: CH4(g)  +  I2(g)  →  CH3I(g)  +  HI(g)       ΔHo = ? It may be helpful to draw the Lewis electron dot structure for each reactant and product; all reactants and products have single bonds. average bond enthalpies (kJ) C - H  413   ,   C - I  240   ,   H - I  299   ,   I - I  151 Express your answer in units of kilojoules, but do not include the units on your submitted answer.

Use heat of formation data from Appendix E to calculate ∆H ° for the following reaction:ClO2 (g) + O(g) → ClO(g) + O2(g)

The standard enthalpies of formation of gaseous propyne, propylene, and propane are +185.4, +20.4, and -103.6 KJ/mol, respectively. Calculate the heat evolved per mole on combustion of each substance to yield CO2 and water. Calculate the heat evolved on combustion of 1 kg of each substance. Which is the most efficient fuel in terms of heat evolved per unit mass?

Decide whether each of the following reactions is product or reactant-favored. Then, calculate the standard enthalpy change of the reaction in each case and draw an energy level diagram to represent it. a) The decomposition of ozone, O3, to oxygen molecules b) the decomposition of MgCO3 (s) to give MgO(s) and CO2(g)

22. Given that the enthalpy of neutralization for the reaction of HCl (a strong acid) and NaOH (a strong base) is always -55.90 kJ per mole of H2O formed, what is the concentration of a 65 mL sample of HCl if the enthalpy of neutralization for the reaction was found to be -5.38 kJ, assuming no heat is lost to the calorimeter?       0.96 M     1.48 M     1.60 M     0.38 M     4.63 M

Write a balanced chemical reaction for the combustion of glucose (C6H12O6).

a) Define the term average bond enthalpy. b) Determine a value for the hydrogenation of propene. Thank you!