Chemistry

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Cyclobutane consisting of molecules in which four carbon atoms form a ring decomposes when heated to give ethylene.
The reaction is first order. In an experiment, the initial concentration of cuclobutane was 0.00150M. After heating at 450 degrees C for 455s. This was reduced to 0.00119M. What was the concentration of cuclobutane after a total of 750s?

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