How long does it take for 78.5% of a phosphine sample
The decomposition of phosphine, PH3, follows first-order kinetics.
4 PH3(g) => P4(g) + 6 H2(g)
The half-life for the reaction at 550 C is 81.3 seconds. How long does it take for 78.5% of a phosphine sample to decompose?
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