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Half-life Question

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Nylorac
 
Reply Sat 11 Feb, 2017 03:09 pm
The thermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction:

4PH3(g) →P(g) + 6H2(g)

The half-life of the reaction is 35.0 s at 680°C.

I found the rate constant which is .0198. I also need to figure out how long it takes for 91% of the phosphine to decompose. How would I do that?
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