Question

specifically calculate the molarity and molality for hydrogen chloride gas dissolved in pure water, at 298K,...

specifically calculate the molarity and molality for hydrogen chloride gas dissolved in pure water, at 298K, to produce a hydrochloric acid solution that is 37.0% HCl and density of solution is 1.19 g/mL

( you have to specific tasks, but how many implied tasks are there. Problem requires...)

- Find molarity for HCl(aq)

- Find molality for HCl(aq)

Basis : 100 gm of solution is assumed, mass of HCl is 37% , mass of HCl= 37 gms moles of HCl= mass/molecular weight, Molecular weight of HCl= 36.5 , moles of HCl =37/36.5=1.013moles

Density of the solution = 1.19 g/mol, volume of solution= mas/volume= 100/1.19 ml=84.03ml

Volume of the solution= 84.03/1000 L=0.08403L

Molarity= Moles of HCl/ per liter of solution= 1.013/0.08403=13.44 M

b) Molality = moels of HCl/ kg of water

Amount of water in the solution= 100-37= 63g =63/1000 kg=0.063kg

Molality= moles of HCl/ kg of water= 1.013/0.063=17.93 m

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