An aqueous solution is 20.0 % by mass hydrochloric acid, HCl, and has a density of 1.10 g/mL.
One liter of this solution, or l000 ml would have a mass of 1100 grams.
If it is 20.0% by mass HCl acid, multiply 1100 grams per liter
solution times 0.2 to get mass of HCI
220 grams of pure HCl per liter of solution.
1100g solution - 220 g HCl = 880 grams of water in the solution.
Now calculate moles of HCl and moles of water.
Moles HCl = 220/36.5 g/mole = 6.03 moles HCl
Now find moles of water. 880/18 g/mole = 48.9 moles water
Now add moles HCl plus moles water to get total moles.
6.03 + 48.9 = 54.93 total moles.
Mole fraction HCl = 6.03/54.93= 0.12
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