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Calculate the standard enthalpy change for the reaction 2A+B⇌2C+2D Use the following data: Substance ΔH∘f (kJ/mol) A -243 B -397 C 191 D -525

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Chemistry

Calculate the standard enthalpy change for the reaction

2A+B⇌2C+2D

Use the following data:

SubstanceΔH∘f
(kJ/mol)
A-243
B-397
C191
D-525

Answer & Explanation Solved by verified expert
3.8 Ratings (646 Votes)

standard enthalpy change =  enthalpy of ( products - reactants)

                                          = 2C + 2D - ( 2A+B)

                                          =   (2 x 191) + (2 x -525) - [ (2 x -243) + (-397) ]

                                         = + 215 kJ/mol
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