According to reference table I, the reaction below is an_______ | 2C(s) + H₂(g) → C₂ | H₂ | ∆H= + 227.6 KJ

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1. According to reference table I, the reaction below is an_______ | 2C(s) + H₂(g) → C₂ | H₂ | ∆H= + 227.6 KJ