lifeisogood Posted June 16, 2005 Share Posted June 16, 2005 The half-life for a certain first order reaction is 13 minutes. If the initial concentration is 0.085M, how many minutes will it take for it to decrease to 0.055M Link to comment Share on other sites More sharing options...
Phi for All Posted June 16, 2005 Share Posted June 16, 2005 Moved to Homework Help. Link to comment Share on other sites More sharing options...
jordan Posted June 16, 2005 Share Posted June 16, 2005 Use the fact that after 13 minutes the mass is now .0425. Put that into the y=Cert equation with C as the initial amount and y as the final amount (half the origional). Solve for r. Then go back and use your new value for r to solve. Link to comment Share on other sites More sharing options...
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