Three independent reactions have disappearance rates r₁ = k₁c, r₂ = k₂c² and r₃ = k₃c³. When concentration is expressed in mol L⁻¹ and time in seconds, all three k values have numerical value 0.20 in

Question

Three independent reactions have disappearance rates r₁ = k₁c, r₂ = k₂c² and r₃ = k₃c³. When concentration is expressed in mol L⁻¹ and time in seconds, all three k values have numerical value 0.20 in their respective units. At c = 0.25 mol L⁻¹, which ordering and ratio are correct?

TestHub · Accepted Answer

The rates are 0.20 × 0.25 = 0.0500, 0.20 × 0.25² = 0.0125 and 0.20 × 0.25³ = 0.003125 mol L⁻¹ s⁻¹. Dividing by the last gives 16:4:1. The numerical equality of rate constants is meaningful only after the units used to quote them are specified; their dimensions are not equal.

Chemistry - Chemical Kinetics Question with Solution | TestHub

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