What amount in grams do you need to prepare 100ml of a 10mM solution of Tris (MWT 121 g/mol)?

Question

What amount in grams do you need to prepare 100ml of a 10mM solution of Tris (MWT 121 g/mol)?

Answer 1

Start with what you got and work toward what you want.

 

10 mM = 10 mmol/L

10 mmol/L x 1 mol/1000 mmol x 121 g/mol x 1 L/1000 ml x 100 ml = 0.121 g

 

Notice how all of the units cancel except for what you wanted -- grams!