The decomposition of phosphine, PH3, to P4( g) and H2( g) is first-order. Its rate constant at a certain temperature is 1.1 min–1.
(a) What is its half-life in seconds?
(b) What percentage of phosphine is decomposed after 1.25 min?
(c) How long will it take to decompose one fifth of the phosphine?
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