Concentration

[Ryan23]

How do you make 200ml of a 0.1M solution of a substance that has a molecular weight of 121.1g/mol?

[CaptainPanic]

If something has a molecular weigth of 121.1 g/mol, and you need 0.1 M (0.1 M means 0.1 mol/liter)...

The info is right in front of you.

 

You should realize that a mol is just a "number of molecules" (but a very large number). It's the same as a dozen or any number.

 

Dozen = 12

Gross = 144 (12*12)

Mol = 6.022*10^23

 

How do you make 200 liter of a 10 eggs/liter mix when the eggs are have a weight of 121.1g/dozen (they're tiny eggs)? I.e. how many grams of egg do you have to add?

 

I'm sure you can answer that question. Just do the same for the molecules. They're a bit smaller, but in the end, the question is the same (note, I changed the numbers a bit, so the answer is, obviously, not the same for both questions).

 

Good luck... and sorry for not giving the answer - we don't answer homework questions here. We want you to learn.

[CharonY]

This is homework, I'll move it. Wheee Tris buffer!