[mburt]

Based on the information that 0.689 g Cr(s) reacts completely with 0.636 g O₂(g) to form a single compound, is CrO₃ the product?

I just converted each mass into moles and got the mole ratio to get:

2Cr(s) + 3O₂(g) 2CrO₃(s)

I know it's a simple question but I was a little stumped on this one because previously I had only heard of Cr having a charge of 2+ or 3+. In this case it has a 6+ charge, so really my question is this:

Can chromium have a 6+ charge?

Thanks,

Mike

[AWK]

http://en.wikipedia.org/wiki/CrO3

[mburt]

Thanks. Oddly enough I searched up CrO₃ in google earlier and couldn't find anything. My problem was that I didn't know what it was called (although I had the thought that it might be called chromium-6 oxide).