Thursday

March 5, 2015

March 5, 2015

Posted by **Confused** on Saturday, November 20, 2010 at 10:36pm.

Radioactive decay of 90Sr,

is characterized by the rate constant k = 0.024 year-1. What is the half-life (in years) for this reaction at the same conditions when the initial concentrations are 0.0356 M? (Round your answer to 3 significant figures.)

Hint: The units of the rate constant are linked with the order of reaction.

Answer:________________years

- Concentration and Reaction -
**DrBob222**, Saturday, November 20, 2010 at 11:10pmRadioactive decay is a first order reaction. t

_{1/2}= 0.693/k

Solve for t_{1/2}.

It doesn't matter that conditions are changed, the half-life is the same; half life of first order reactions don't depend upon the initial concn. You can show that, however, by using

ln(No/N) = kt

Substitute 0.0356 M for No and half that for N and 0.024 for k. t_{1/2}will be the same as obtained by 0.693/0.024.

**Answer this Question**

**Related Questions**

college chemistry - The rate of the following reaction: 2 NO2 2 NO + O2, is ...

Chemistry - In a given 1st order reaction A ---> products, the initial ...

AP Chemistry - I have no idea where to start with this problem: A certain ...

Ap Chemistry - I have no idea where to start with this problem: A certain ...

Chemistry Lab - What would happen to the reaction rate of a solution if 10 mL or...

Chemistry Lab - What would happen to the reaction rate of a solution if 10 mL or...

Chemistry - The reaction 2B--->C + 2D is found to be zero order when run at ...

chem - Butadiene can undergo the following reaction To form a dimer(two ...

Chemistry - In a reversible reaction, chemical equilibrium is attained when ? 1...

Chemistry - The rate constant for a second-order reaction is 0.54 M-1s-1. What ...