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Rates question (A2)

For a given initial reactant pressure, the half life for a first order gaseous reaction was found to be 30 minutes.

If the experiment were repeated at half the initial reactant pressure, the half life would be?

Okay, the answer is 30. But I have no idea why :redface:

Anyone know why? Thanks :biggrin:
Original post by Mr Tall
For a given initial reactant pressure, the half life for a first order gaseous reaction was found to be 30 minutes.

If the experiment were repeated at half the initial reactant pressure, the half life would be?

Okay, the answer is 30. But I have no idea why :redface:

Anyone know why? Thanks :biggrin:


The half life of any first order process is independent of the concentration. Radioactive decay is the classical first order process: the half life of every radioisotope is constant.
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Mr Tall
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Original post by charco
The half life of any first order process is independent of the concentration. Radioactive decay is the classical first order process: the half life of every radioisotope is constant.

ok, many thanks

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