7B.1

[Savannah Mance 4G]

For this problem, I'm confused on how to solve the rate equation with the given info. I know I'm supposed to use the equation with K=1/t*ln(A initial)/(A) but I don't get how the initial mass given is put into the equation to solve.

[KSong_1J]

You plug the initial mass into [A]initial! I suggest rearranging the equation to [A] = [A]initial*e^-kt to make it easier to solve (since you’re solving for [A]) and don’t forget to convert 5.0 hours into minutes (since the units for k is given as min^-1)! Hope this helps :)

[Savannah Mance 4G]

Why can you plug in the grams of the drug if you don't know what volume it is in? Since it's asking for concentration, how come you can plug in the 0.02 grams?

[Nick Fiorentino 1E]

I think if you're only given one thing (like mass) then you have to plug it in and it will work as long as you are using like values