An aqueous solution is 6.00 % by mass hydrochloric acid, HCl, and has a density

Chemistry
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An aqueous solution is 6.00 % by mass hydrochloric acidHCl, and has a density of 1.03 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 l030 grams. If it is 6.00% by mass HCl acid, multiply l020 grams per liter solution times 0.06 to get mass of HCI

  61.8 grams of pure HCl per liter of solution. Now subtract the mass of pure HCl from the mass of the solution.

l030g solution - 61.8 g HCl = 968.2 grams of water in the solution.

Now calculate moles of HCl and moles of water.

Moles HCl = 61.8/36.5 g/mole = 1.7 moles HCl

Now find moles of water. 968.2/18 g/mole = 53.8moles water

Now add moles HCl plus moles water to get total moles.

1.7+ 53.8 = 55.5  total moles.

Mole fraction HCl = 1.7/55.5 = 0.0306

May 28th, 2015

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