No, it's Al2O3.
Post your work and I'll find the error.
I suspect you rounded 1 to 1.5 to 2:2 whereas 1:1.5 is 2:3. Rounding a fraction that much is not acceptable.
While trace impurities of iron and chromium in natural corundum form the gemstones ruby and sapphire, they are basically a binary compound of aluminum and oxygen, with 52.9% Al. Find the empirical formula and give the chemical name for corundum.
the answer is Al2O2
but i don't get it
1 answer