Gradebool -Print Calculator Periodic Table Question 27 of 31 Sapling Learning ma

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Gradebool -Print Calculator Periodic Table Question 27 of 31 Sapling Learning macmilan leaming The 1995 Nobel Prize in Chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning the formation and decomposition of ozone in the stratosphere. Rowland and Molina hypothesized that chlorofluorocarbons (CFCs) in the stratosphere break down upon exposure to UV radiation, producing chlorine atoms. Chlorine was previou of ozone into oxygen gas usly identified as a catalyst in the breakdown Using the enthalpy of reaction for two reactions with ozone, determine the enthalpy of reaction for the reaction of chlorine with ozone (1) cioW-o,k) cle) +20,4) Cl(g) Mri. =-122.8 AH.--122.8 kJ -> 20 kJ (2) 203(x) 302(g) AH 285.3 kJ kJ Next Exit O Previous Give up & View Solution O check Hint

Explanation / Answer

Heat of reaction you want

O3(g) + Cl (g) ---------> ClO(g) + O2 (g) Hrxn = ?

Equations you have
ClO (g) + O3 (g) -----> Cl (g) + 2O2 (g) H rxn = -122.8 kJ
2O3 (g) -----> 3O2 (g) Hrxn= -285.3 kJ

Reverse the first equation including the sign

Equations you have
Cl (g) + 2O2 (g)-----> ClO (g) + O3 (g) H rxn = +122.8 kJ
2O3 (g) -----> 3O2 (g) Hrxn= -285.3 kJ

Add the two equations

Cl (g) + 2O2 (g) + 2O3 (g) ---> ClO (g) + O3 (g) + 3O2 (g) H rxn = +122.8 kJ + (-285.3 kJ)

The 2O2 on the left cancel two of the O2 on the right hand side.
1 of the O3 on the left hand side cancel the O3 on the right hand side

Cl (g) + O3 (g) ---> ClO (g) + O2 (g) H rxn = -162,5 kJ

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