Calculate molarity and morality of 40% of NaOH(w/w). The density of solution is 1.2 g/ml
Firstly, 40% NaOH implies 40 g NaOH in 100g solution.
Thus, mass of NaOH = 40g
No. of moles = Given mass / Molar mass = 40/40 = 1 mol
Now, assuming solvent to be water since it isn't specified, density of water = 1g/mL
Also, mass of solution = 100g
Thus density = mass / volume
Which implies, 1 = 100 / volume
Therefore, Volume = 100mL
Now, molarity = no. of moles / volume in L
Molarity = 1 x 1000 / 100
Molarity = 10M