Posted by **csb** on Tuesday, October 5, 2010 at 2:20pm.

a reaction is first order and it takes 324 minutes for the reaction to be 50% complete. How long will it take for the reaction to be 85% complete at the same temperature?

- chemistry -
**DrBob222**, Tuesday, October 5, 2010 at 2:49pm
ln(No/N) = kt

ln(100/50) = k*324.

Solve for k, then substitute back into

ln(100/15) = k*t and solve for t.

- chemistry -
**csb**, Tuesday, October 5, 2010 at 6:18pm
it says the answer is 887 minutes. am i doing something wrong . when i use that formula i don't get 887

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