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Hint: Answers are a) 16.22 dm^3/mol*h

b) 5.1 × 10^3 s, 2.1 × 10^3 s

My Attempt:

[A]intial= 0.075 mol dm^-3

[A]= 0.20

x=[A]initial-[A]=0.075-0.20= 0.055

**intial=0.050 mol dm^-3**

**=0.050-x= 0.050-0.055= -0.005**

this is where I'm confused because I get a negative forthis is where I'm confused because I get a negative for

**. When I plug that into the integrated rate law, I get a nonreal number. The integrated rate law is**

kt(kt(

**initial-[A]initial)=ln([A]intial****/[A]****intial)**

Any idea?Any idea?