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A chemical engineer is studying the rate of this reaction. 2 NH3(g) → N2(g) + 3 H2(g) He fills a reaction vessel with NH3 and measure its concentration as the reaction proceeds. Here's a graph of his data: What is the half-life of this reaction? Suppose the rate of reaction is known to be first order in NH3. Calculate the value of rate constant k. Predicts the concentration of NH3 in the engineer's reaction vessel after 2.4 seconds have passed.