Homework Help: Chemistry

Posted by Joanna on Sunday, January 31, 2010 at 3:10am.

The rate constant for a certain reaction is = 4.30×10−3 s^-1. If the initial reactant concentration was 0.400 M , what will the concentration be after 19.0 minutes?

Rate would be first order therefore I used.

A=A initial*e^-kt

I keep getting .0030 M but supposely I am wrong can anyone help me or tell me what I am doing wrong?

Chemistry - drwls, Sunday, January 31, 2010 at 3:57am
19 minutes is 1140 s, so kt = 4.90

The molarity should decrease to 0.400*e^-4.9 = .0030 (M)

I agree with your answer

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