The decomposition of phosphine [obscured] on tungsten at low pressure is a [obscured] reaction. It is because the

Question

1. rate is inversely proportional to the surface coverage 2. rate is independent of the surface coverage 3. rate of decomposition is very [obscured] 4. rate is proportional to the surface coverage

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Answer: 4. rate is proportional to the surface coverage Key idea: on a metal surface at low pressure the surface is not saturated, so the rate depends on how much of the surface is covered. Here the rate is proportional to the surface coverage, which makes the reaction first order. If the surface were saturated, the rate would be independent of coverage (zero order).

The decomposition of phosphine [obscured] on tungsten at low pressure is a [obscured] reaction. It is because the

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