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suter [353]
3 years ago
12

Convert 400g of phosphoric acid to moles.

Chemistry
1 answer:
Katarina [22]3 years ago
3 0

Answer: 4.08183 or you can round it to 4

Explanation:

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Finding percent composition is fairly easy. You only need to divide the mass of an element by the total mass of the compound. We can do this one element at a time.

First, let's find the total mass by using the masses of the elements given on the periodic table.

7 x 12.011 (mass of Carbon) = 84.077

5 x 1.008 (mass of Hydrogen) = 5.04

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Add all of those pieces together.

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Hydrogen: 5.04 / 227.132 = 0.022189 ≈ 2.22 %

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Oxygen: 95.994 / 227.132 = 0.42263 ≈ 42.26 %

You can check your work by making sure they add up to 100%. The ones I just found add up to 99.99, which is close enough. A small difference (no more than 0.03 in my experience) is just a matter of where you rounded your numbers.

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