Molality and Molarity question?

Question

the molaroty on NaCl in 6.25M. The density of the solution is 1.34g/ml or kg/l. Calculate the Molality

The molality of NaCl is 0.125m, the density of the solution is 1.08g/ml or kg/l. Calculate the molarity

Answer 1

In each case, let the NaCl solution be called S

1.) 6.25molNaCl/1LS x 1LS/1.34kgH2O = 4.66 mol NaCl/1 kg H2O Which is molality.

2.) 0.125molNaCl/1kgH2O x1LS/1.08kgH2O = 0.116 molar