What is the formula unit for a compound made from Fe3+ and oxygen?
2 answers:
Answer : The correct option is,
Explanation :
Formula unit of a compound is defined as the minimum number ratio of ions represented in the compound.
The valency of iron is (+3) and the valency of oxygen is (-2). By the criss-cross method the cation combine with the anion, it will give .
The formula by criss-cross method is shown below.
Fe2O3 because O has a -2 charge and Fe and +3, you want the charges to equal each other so if you have 2 Fe with +3 charge the charge becomes 6 if you have 3 O with -2 charge the charge becomes 6.
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I would say d but I’m not sure