Chemistry help please

Question

What is the molarity of a solution that contains 5 moles of NaNO3 in 550. mL of solution?

	A) 0.01 M
	B) 9.1 M
	C) 2.75 M
	D) 13.0 M
	E) 2750 M

Answer 1

molarity is defined as moles solute per liter of solution

moles of solute = 5 moles

liters of solution = 550 ml x 1 L/1000 ml = 0.550 L

Molarity = 5 moles/0.550 L = 9 M (option B) even though 5 moles has only 1 sig fig so answer should not have 2 sig. figs.