Posted by mandy on Monday, May 3, 2010 at 9:44pm.
10% of a sample reacts in 25 s. If the reaction follows first order kinetics, how long would it take for half the sample to react?

Chemistry  DrBob222, Monday, May 3, 2010 at 10:20pm
ln(No/N) = kt
If we start with an arbitrary number, say 100, and 10% is used, that would leave 90
ln(100/90) = k(25sec)
solve for k. You want the half life; therefore, substitute the k you find in the same equation but this time start with 100 and N = 50 (half is gone). Solve for t and that will be t_{1/2}

Chemistry  Anonymous, Friday, March 22, 2013 at 12:17am
Ei
Answer This Question
Related Questions
 chemistry  Radioactive decay is a process that follows firstorder kinetics. ...
 chemistry  If the breakdown halflife of a pesticide applied to a farmerâ€™s ...
 Chemistry  Gallium65, a radioactive isotope of gallium, decays by first order...
 Chemistry  The given reaction, 2N2O5 4NO2 + O2, follows firstorder kinetics ...
 Chemistry  What is the value of the rate constant for a reaction in which 75.0 ...
 Chemistry  What is the value of the rate constant for a reaction in which 75.0 ...
 Inorganic chemistry  The decopostion of formic acid follows firstorder ...
 chemistry  follows firstorder kinetics and has an activation energy of 244 kJ ...
 chemistry  What is the halflife of a compound if 69 percent of a given sample ...
 chemistry  The given reaction, cyclopropane propene (isomerization), follows ...
More Related Questions