What will be the molarity of 4% (w/v) solution of NaOH?

Number of moles of NaOH = 4g / 40 gmol^-1

                                            = 0.1 mol

Therefore molarity = (Number of moles of solute / Volume of solution in L)

                               = [(0.1 / 100) x 1000]

                               = 1M