Homework Help: Chemistry(Please check)

Posted by Hannah on Sunday, February 19, 2012 at 11:21pm.

The initial concentration of a reactant in a first order reaction is 0.620 molar. What will be its concentration after 3 half-lives?

I did 0.620 -> 0.31 ->0.155

0.155M will be the concentration. Is this correct?

Chemistry(Please check) - DrBob222, Sunday, February 19, 2012 at 11:44pm
You're ok as far as you went but you only went through 2 half lives.
0.620 start becomes 0.310 after 1.
0.310 becomes 0.155 after 2.
0.155 becomes ..... after 3.
Chemistry(Please check) - Hannah, Monday, February 20, 2012 at 12:21am
Oh ok I did realize that. Now I got 0.0775M
Chemistry(Please check) - DrBob222, Monday, February 20, 2012 at 12:26am
ok

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