An industrial chemist is studying the rate of the Haber synthesis: N2 + 3H2 → 2NH3. Starting with a closed reactor containing 1.35 mol/L of N2 and 0.20 mol/L of H2, she finds that the H2 concentration has fallen to 0.12 mol/L after 20. seconds.What is the average rate of NH3 production for this example?   Estimate the N2 concentration after 40 seconds?

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