The decomposition of ammonia on a metal surface to form N₂ and H₂ is a zero-order reaction (Figure 14.7c). At 873°C, the value of the rate constant is 1.5 × 10⁻³ mol/L ∙ s. How long it will take to completely decompose 0.16 g of NH₃ in a 1.0-L flask?

Data given in Figure 14.7c

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Time [NO₂] (s) (mmol/L) 200 280 600 750 800 900 1.75 1.65 1.15 0.94 0.85 0.70 [NH3], mmol/L (1 mmol = 10-³ mol) 2.00 1.50 1.00 0.50 0 NH3(g) →→→ N₂(g) + ¾/2 H₂(g) 200 400 600 Time (t), seconds 800 1000 Rate = K[NH₂]° Slope = -k (0.540 - 1.29) mmol/L (1000 - 500) s = -1.5 x 10-³ mmol/L.s k = 1.5 x 10-³ mmol/L.s =