# Problem: The rate constant for this first-order reaction is 0.0800 s-1 at 400 °C. A→ Products. After how many seconds will 12.1% of the reactant remain? _____s

###### FREE Expert Solution

We’re given the following first-order reaction:

A→ Products

The integrated rate law for a first order reaction is as follows:

where:

[A]t = concentration at time t

k = rate constant

t = time, [A]0 = initial concentration

We’re being asked to determine the time it would take for the reaction to be 12.1% complete. Since no concentration is given, we can use the given percentages in place of concentration.

90% (140 ratings) ###### Problem Details

The rate constant for this first-order reaction is 0.0800 s-1 at 400 °C. A→ Products. After how many seconds will 12.1% of the reactant remain? _____s

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