The Decomposition of Phosphine,PH₃,follows First-Order Kinetics

question 38

Multiple Choice

The decomposition of phosphine,PH₃,follows first-order kinetics. 4 PH₃(g) → P₄(g) + 6 H₂(g)
The half-life for the reaction at 550 °C is 81.3 seconds.What percentage of phosphine remains after 195 seconds?

• A) 2.2%
• B) 9.8%
• C) 19%
• D) 42%
• E) 58%

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