I have this question about molality, and I am confused about which numbers to use.
A 40.0mL sample of 0.130 M NaCl is diluted to 100.0 mL. What is the molality of the resulting solution?
molality = moles of solute/mass of solvent(kg)
molality = 0.130M/1000(kg) x this is where i am confused on which numbers to use?