3. At 583 K, AsH3 (gas) decomposes to form As(sol) and hydrogen. During the reaction T and V=const. The total pressure in the system changes as follows.
t, hour 0 5.6 6.5 8.0
Р*10-3, Pa 97.75 107.41 109.05 11.35
Show that this reaction is a 1st order reaction and calculate the rate constant.

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