Liter

... are typically M^-1 cm^-1; in that case, a 1cm cell path length cancels out the cm^-1 unit and you'll end up with a concentration in moles/liter. Watch the units on your extinction coefficient, sometimes they are different (you could, for instance, have an extinction coefficient calibrated ...

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... of molecules. No reason to make that since both are equivalents. But I would guess it's because of the last sentence "10^13 ssDNA strands per liter and that's a lot"

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Yes, pretty much, as there are a million milligrams in a Liter (kilogram) of water.

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Imagine you have 10 g of sodium in 1 liter of water, OK? That means that the level of sodium is 10 g/l. Now, you get rid of 200 ml of water, but no sodium. Now you have 10 g in 800 ml, i.e. 12,5 g/l. Is the concentration the same?

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... and the MW is 2438Da. I have epsilon = 25320 / (g/L)*cm, is this correct? so if c= A/epsilon, is the calculation just 0.57/25320 = .0000225 moles/Liter, or .0000225M? i cant figure out where to use the MW. Thanks!

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