A student has studied the decomposition of a gas at . He obtained the following data:

| | Relative |
|:---:|:---:|
| 50 | 4 |
| 100 | 2 |
| 200 | 1 |
| 400 | 0.5 |

The order of the reaction is

Question

A student has studied the decomposition of a gas  at . He obtained the following data:

|  | Relative  |
|:---:|:---:|
| 50 | 4 |
| 100 | 2 |
| 200 | 1 |
| 400 | 0.5 |

The order of the reaction is

Canvas Classes · Accepted Answer

For an th order reaction:

From the data: when pressure doubles (50→100),  halves (4→2). So , meaning .

Verification: 100→200 (×2):  goes 2→1 (÷2) ✓; 200→400 (×2):  goes 1→0.5 (÷2) ✓

Answer: Option (2) — 2 (second order)

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