14. Given the thermochemical data:

What is the △H° for the reaction: 2 CH4→ C2H4 +2 H2?
(A) a/2-d+ b/2
(B)-a+b + 2c + d/2
(C) 2b-d/2-a/2-c
(D) a-b+2c + d
(E) b+d-a-2c

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統計： A(0), B(1), C(3), D(0), E(0) #3847790