SOLVED: The decomposition of phosphine, PH3, follows first-order kinetics:4PH3 (g) —> P4 (g) 6H2 (g)The half-life for the reaction at 550°C is 81.3 seconds. How long does it take for the reaction to be 78.5% complete?8.52 seconds28.4 seconds63.8 seconds117 seconds180 seconds
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