3. What reactions are first order reactions? What equation describes it?
Find the amount of substance (a - x) remaining undecomposed after the expiration of time t, according to the half-life values τ given in the table, based on the given initial amount of substance a (all processes are described by first-order kinetic equations of reactions).

No. τ а — х а, mol/l t Process
3 6.63 . 103 sec 0.01 10 min 2F2O = 2F2 O2

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