I need help for my final?

Question

How many grams of Nacl are needed to make 400 ml of a .100 M solution? I know the answer is 2.34 g, but I need a clear simple step by step explanation

Answer 1

You need to use the concepts of stoichiometry. Knowing the molarity (moles/L) and the volume(mL), you can find the moles of NaCl. Just remember to change the mL to L so the units will cancel. Once you have the moles of NaCl, use the molecular weight of NaCl (g/mole) to convert moles to g.

Your problem should look like this (you supply the numbers)
mL*(L/1000mL)*(moles/L)*(g/mole)= grams

Answer 2

5.85 * .4