The hermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction: 4PH3(g) → P4(g) + 6H₂(g) The half-life of the reaction is 35.0 s at 680°C. Calculate (a) the first-order rate constant for the reaction, and (b) the time required for 95 percent of the phosphine to decompose.

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