Question
Asked Dec 24, 2019
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Calculate ?H° for each reaction.
a. HO• + CH4 -> •CH3 + H2O
b. CH3OH + HBr -> CH3Br + H2O

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Expert Answer

Step 1

The chemical equation for the given chemical reaction is shown in equation (1).

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) HO(g)+CH, (g) >CH; (g)+H,0(g),..(1)

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Step 2

The standard enthalpy of a reaction (ΔrHo) is defined as the equation (2) where ΔfHoHO. is the standard enthalpy change of formation for hydroxyl radical, ΔfHoCH4(g), ΔfHoCH3(g), and ΔfHoH2O(g) is the standard enthalpy change for the formation of methane, methyl radical, and water vapor respectively. The values for standard enthalpy change for the formation of methyl radical, water vapor, hydroxyl radical, and methane are substituted in equation (2). The standard enthalpy of reaction is -60.23 kJ/mol.

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+A,Hôn49) 2) +A;Hµ,0(3) A;H. Д,Н° %3D Δ. Η OH(g) H;O(g) CH4(g) ..... CH;(g) = (145.69 kJ mol– 241.8 kJ mol")-(38.99 kJ mol – 74.87 kJ mol") =-60.23 kJ mol-

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Step 3

The chemical equation for the given chemical reaction is shown in equation (...

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)+ HBr/(g) —>сH, Br (8) +Н,О (1)... (3) .... ..

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