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hi have the equation AuxOy which makes gold oxide. How do i find out how much x there is and how much y there is? i know that there is 89.15% Au in the equation.

2007-09-30 18:07:39 · 1 answers · asked by Anonymous in Science & Mathematics Chemistry

1 answers

Atomic weight of gold = 196.97
Atom W. of oxygen = 16

Now, assume you got 1 mole of gold, or 196.97g. This is the 89.15% of the compound. The rest 10.85% is oxygen, this is

(196.97/89.15)*10.85 = 23.97 g

or 23.97/16 = 1.5

So, you get 1.5 moles of oxygen per mole of gold. In order to get integer numbers, you can say that there is 3 moles of oxygen per every 2 moles of gold, in other words

x might be 2 and y might be 3. Au2O3

But becareful, sometimes this excercise doesnt work, because Au4O6 also satisfies the considerations. So, being devil's advocate, you may need more info.

2007-09-30 19:31:06 · answer #1 · answered by Manuelon 4 · 0 0

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