NEED HELP NOW PLEASE!

Question

What is the molarity of a solution that contains 80 g of NaOH in 2000 mL of solution?

	0.04 M
	1 M
	0.001 M
	2 M

Answer 1

Molarity is moles of a substance over liters of a substance.

M=mol/L

So if you have grams of NaOH you can get moles.

Atomic weight of NaOH: Na 22.989 + O 16.00+ H 1.01

Total: 39.999g/mol

80g*1mol/39.999g, grams cancel top to bottom and you have 2mol of NaOH.

Now you need the correct volume in liters.

You are given 2000ml

1000ml= 1L

2000ml*1L/1000ml, mL cancel top to bottom and you have 2L.

So you have 2mol/2L of NaOH.

This would give you a Molarity solution of 1M.

Option 2 or B would be the correct choice.