Homework Help: Chemistry

Posted by Emily on Monday, October 18, 2010 at 4:10pm.

Given a 2.5 kg solution of phosphoric acid and water (56 % phophoric acid, by mass), calculate the number of moles of phosphoric acid.

Chemistry - DrBob222, Monday, October 18, 2010 at 5:11pm
56% H3PO4 bu mass means 56 g H3PO4 in 100 g solution.
YOu have 2.5 kg or 2,500 g of the soln, therefore, you have
56 g H3PO4 x (2,500 g/100 g) = ?? g H3PO4.
Then number of moles = grams/molar mass.

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