How do you calculate the natural logarithm in this?

[VeraMaria]

Hello there cracks!

I have a (simple) question on the following things:

How did they get in this equation to the following result?


The took the ln of the mean concentration (I guess) of 13.5 * 10^-9 moles/Liter
and the outcome of this was ln 13.5.

I came to the conclusion (AH!) because on the other examples in ln XX the XX was always the number before the "*10^-9")

How do you get to this result? I do not really get it!

Thanks you for answers!

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[stapel]

How did they get in this equation to the following result?

The took the ln of the mean concentration (I guess) of 13.5 * 10^-9 moles/Liter and the outcome of this was ln 13.5....

How do you get to this result? I do not really get it!

Please post the complete exercise, including the instructions, so we can try to figure out what is going on here. Thank you!