What is the formula for iron(III) fluoride?
A. FeF
B. $Fe _3 F_3$
C. $FeF _3$
D. FesF
Answer (1)
Iron(III) has a +3 charge ( F e 3 + ).
Fluoride has a -1 charge ( F − ).
Balance the charges: three fluoride ions are needed to balance one iron(III) ion.
The chemical formula for iron(III) fluoride is F e F 3 .
Explanation
Understanding the Problem The problem asks for the chemical formula of iron(III) fluoride. We need to determine how many iron and fluoride ions are needed to form a neutral compound.
Identifying the Ions and Charges Iron(III) has a +3 charge, written as F e 3 + . Fluoride has a -1 charge, written as F − . To form a neutral compound, the positive and negative charges must balance.
Balancing the Charges To balance the +3 charge of iron(III), we need three fluoride ions, each with a -1 charge. This gives us a total negative charge of -3, which cancels out the +3 charge of the iron(III) ion.
Writing the Chemical Formula Therefore, the chemical formula for iron(III) fluoride is F e F 3 . This indicates one iron(III) ion and three fluoride ions.
Final Answer The chemical formula for iron(III) fluoride is F e F 3 .
Examples
In chemistry, understanding how elements combine to form compounds is crucial. For example, iron(III) fluoride, F e F 3 , is used in certain chemical processes and as a catalyst. Knowing its formula allows chemists to accurately calculate the mass ratios of iron and fluorine needed for a reaction, ensuring the desired product is formed efficiently and safely. This principle extends to many other compounds, making the ability to determine chemical formulas essential for practical applications in the lab and industry.
