Question

Calculate the morality of the solution 0.450 mol of Na2S in 1.75 L of solution

Answer 1

I didn't know solutions at the opportunity to be immoral. :-).

I assume you meant to type molarity (and not molality).
M = moles/L soln.

Answer 2

what is the molarity of 0.450 mol of na2s in 1.65 l of solution