chemistry

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Azomethane, CH3NNCH3, is not a stable compound, and once generated, it decomposes. The rate of decomposition was measured by monitoring the partial pressure of azomethane, in torr.
Time (min) 0, 15, 30, 48, 75
Pressure(torr)36.2, 30, 24.9,19.3, 13.1
Determine the instantaneous rate of decomposition of azomethane at t=20 min.

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