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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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Bananas Bananas
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10 years ago
I got this incorrect and I am not sure why. Can someone tell me the correct answer and what i did wrong please?

A chromium oxide compound contains 52.0 grams of chromium and 24.0 grams of oxygen. What is the most likely empirical formula of this compound?


Answer: CrO
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#1
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10 years ago
The atomic mass of O is 16, and the atomic mass of Cr is 52.

the most safe way to solve this problem, is to find the moles of Cr atoms and O atoms:
moles of Cr atoms= mass of Cr/atomic mass of Cr=52/52=1mol
moles of O atoms= mass of O atoms/atomic mass of O = 24/16=1,5.

So, for every 1 atom of Cr you should have 1,5 atoms of O. OR BETTER: for every 2 atoms of Cr, you should have 3 atoms of O. This means that the formula should be: Cr2O3
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