Question

What volume of 0.4 mole of nacl will contain 0.585g of nacl

Answer 1

The question makes no sense to me. 0.585 g NaCl is 0.1 mol and not 0.4. If you know the density then mass = volume x density and v = m/d

Answer 2

oops. Sorry about that but 0.585 g NaCl is 0.01 mol NaCl.
0.585/58.5 = 0.01