We are working on molarity of a solution in my class, and I am a little stumped on how to set the problems up. Here is one question from my homework.

Question

How many grams of NaCl are needed to make 575mL of 1.5 M NaCl solution?

Thank you in advance :)

Answer 1

How many mols do you need? That's M x L = mols NaCl.
Then mols NaCl = grams NaCl/molar mass NaCl. You know mols and molar mass; solve for grams.