4PH, (e)- P,(e) + 6H₂(e) The half-life of the reaction is 28.9 s at 680 °C. Part 1 of 2 0.0240 s Calculate the first-order rate constant for the reaction. Be sure your answer has the correct number of significant digits. Part: 1/2 nosphorus and molecular hydrogen is a Part 2 of 2 rder reaction Calculate the time required for 89.0 percent of the phosphine to decompose. Be sure your answer has the correct number of significant digits. X

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The thermal decomposition of phosphine (PH₂) into phosphorus and molecular hydrogen is a first-order reaction:
4PH, (e) P,(e) + 6H₂ (g)
The half-life of the reaction is 28.9 s at 680 °C.
Part 1 of 2
Calculate the first-order rate constant for the reaction. Be sure your answer has the correct number of significant digits.
→
0.0240 s
Part: 1/2
Part 2 of 2
Calculate the time required for 89.0 percent of the phosphine to decompose. Be sure your answer has the correct number of significant digits.
0.9
X
Transcribed Image Text:The thermal decomposition of phosphine (PH₂) into phosphorus and molecular hydrogen is a first-order reaction: 4PH, (e) P,(e) + 6H₂ (g) The half-life of the reaction is 28.9 s at 680 °C. Part 1 of 2 Calculate the first-order rate constant for the reaction. Be sure your answer has the correct number of significant digits. → 0.0240 s Part: 1/2 Part 2 of 2 Calculate the time required for 89.0 percent of the phosphine to decompose. Be sure your answer has the correct number of significant digits. 0.9 X
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