half-life of the reaction is 31.0 s at 680 °C. art 1 of 2 Calculate the first-order rate constant for the reaction. Be sure your answer has the correct number of significant digits. 0.0223 s art: 1 / 2 -1 art 2 of 2 Calculate the time required for 79.0 percent of the phosphine to decompose. Be sure your answer has the correct number x10

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