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 28.7 s at 680 °C. Part 1 of 2 Calculate the first-order rate constant for the reaction. Round your answer to 3 significant digits. 1 Part: 1/2 1 Part 2 of 2 0 x10 X Calculate the time required for 86.0 percent of the phosphine to decompose. Round your answer to 3 significant digits. X

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The thermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction:
4PH₂(g) → P4(g) + 6H₂(g)
The half-life of the reaction is 28.7 s at 680 °C.
Part 1 of 2
Calculate the first-order rate constant for the reaction. Round your answer to 3 significant digits.
Part: 1 / 2
Part 2 of 2
x10
X
S
X
Calculate the time required for 86.0 percent of the phosphine to decompose. Round your answer to 3 significant digits.
0|0
Ś
Transcribed Image Text:The thermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction: 4PH₂(g) → P4(g) + 6H₂(g) The half-life of the reaction is 28.7 s at 680 °C. Part 1 of 2 Calculate the first-order rate constant for the reaction. Round your answer to 3 significant digits. Part: 1 / 2 Part 2 of 2 x10 X S X Calculate the time required for 86.0 percent of the phosphine to decompose. Round your answer to 3 significant digits. 0|0 Ś
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