# Cyclobutane, C4H8, decomposes when heated to ethylene, C2H4. The reaction is first order. In an experiment the initial concentration of cyclobutane was 0.00150 M. After heating at 450°C for 455 seconds, this was reduced to 0.00119 M. What was the concentration after 936 seconds?

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Cyclobutane, C4H8, decomposes when heated to ethylene, C2H4. The reaction is first order. In an experiment the initial concentration of cyclobutane was 0.00150 M. After heating at 450°C for 455 seconds, this was reduced to 0.00119 M. What was the concentration after 936 seconds?

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Step 1

Cyclobutane, C4H8, decomposes when heated to ethylene, C2H4.

The reaction is first order.

Step 2

In an experiment,

the initial concentration of cyclobutane was = 0.00150 M

After heating at 450°C for time (t) = 455 seconds

final concentration of cyclobutane was reduced = 0.00119 M

Let us first calculate the value of rate constant (k) for a first-order reaction

formula,

ln[final concentration] = ln[initial concentration] - rate constant x time

or,

ln(0.001...

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