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Use the thermochemical data that follow to calculate the value of H⁰ for the reaction:
4B→2A+C+2F
A+2B→E, H⁰ = 75kJ
C+2D→2E, H⁰ = -25kJ
f+2a→D, H⁰ = 45 kJ
a. 215 kJ
b. 85 kJ
c. -95 kJ
d. 55 kJ
e. -215 kJ

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