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September 18, 2014

Homework Help: Chemistry - Half-life

Posted by Aria on Wednesday, April 25, 2012 at 5:17pm.

Phosphene decomposes to phosphorus and hydrogen in a first order mechanism. 4PH3(g) --> P4(g) + 6H2(g)
This reaction's half-life is 35.0 s at 680 degrees C. If you had 520 mmHg of phosphene in an 8.00-L flask, how long does it take for the pressure in the flask to rise to standard pressure?

The answer is 48.3 s, I am just not sure how to do it out.

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