suppose u r given a conc soln of hcl which is known to be 37% hcl & has a soln density of 1.19g/ml. What is the molarity and molality of hcl in this soln
37%=37g of HCl
100 total g of solution-37g of HCl=63g of solvent=0.063Kg of solvent
37g of HCl/36.5 g/mol=mols of HCl
Since total weight is 100g and density=mass/volume, solve for volume
mass/density=volume=100g/1.19g/mL= volume of solution
convert volume from mL to L
Molarity=mols of HCl/volume of solution in L
Molality=mols of HCl/0.063Kg of solvent