An aqueous solution is 20.0 % by mass hydrochloric acid, HCl, and has a density

Chemistry
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An aqueous solution is 20.0 % by mass hydrochloric acidHCl, and has a density of 1.10 g/mL. 


The mole fraction of hydrochloric acid in the solution is  .
May 28th, 2015

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

May 28th, 2015

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