(a) Explain the following terms :
(i) Rate of a reaction
(ii) Activation energy of a reaction
(b) The decomposition of phosphine, PH3, proceeds according to the following equation:
4PH3 (g) P4(g) + 6 H2(g)
It is found that the reaction follows the following rate equation:
Rate = K[PH3].
The half - life of PH3 is 37.9 s at C.
(i) How much time is required for 3/4 th of PH3 to decompose?
(ii) What fraction of the original sample of PH3 remains behind after 1 minute?
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