The thermal 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. The first-order rate constant for the reaction is 0.0198/s. Calculate the time (in seconds) required for 95 percent of the phosphine to decompose.

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