Ammonia combusts in oxygen according to the equation 4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6…

CHEMISTRY · Multi-part · AP · Chemistry · Kinetics · Kinetics

Problem

Ammonia combusts in oxygen according to the equation 4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g) A well-mixed gas sample in a constant-volume container has the following measured concentrations. All concentrations are in mol L⁻¹.
Time (s)[NH₃][O₂][NO][H₂O]
00.2000.3000.0000.000
1200.160—————————
2400.120———0.080———
Respond to the following prompts. (1) Determine [O₂] at 120 s and at 240 s, and enter the values in the table. (2) Determine [NO] at 120 s and [H₂O] at both 120 s and 240 s, and enter the values in the table. (3) Using your completed table, calculate the average rate of disappearance of O₂ (in mol L⁻¹ s⁻¹) between 120 s and 240 s.

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