The Haber reaction for the manufacture of ammonia is: N2 + 3H2 → 2NH3 Without doing any experiments, which of the following can you say MUST be true? The activation energy is positive. Disappearance rate of H2 = 3 (Disappearance rate of N2). Reaction rate = -Δ[N2]/Δt. Disappearance rate of N2 = 3 (Disappearance rate of H2). The reaction is first order in N2. The reaction is not an elementary reaction. Δ[H2]/Δt will have a positive value.

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