Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

3. Chemical Reactions

Naming Ionic Compounds

General Chemistry

3. Chemical Reactions

Naming Ionic Compounds

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Multiple Choice

What is the correct chemical formula for iron(III) phosphide?

Fe2P3

FePO4

Fe3P2

FeP

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Verified step by step guidance

Identify the ions involved in the compound. Iron(III) indicates the iron ion has a charge of +3, written as Fe^{3+}. Phosphide is the ion formed by phosphorus with a charge of -3, written as P^{3-}.

Determine the ratio of ions needed to balance the overall charge of the compound. Since Fe^{3+} has a +3 charge and P^{3-} has a -3 charge, the total positive and negative charges must balance to zero.

Set up the charge balance equation: let the number of Fe^{3+} ions be x and the number of P^{3-} ions be y. The total charge is 3x + (-3)y = 0, which simplifies to 3x = 3y, or x = y.

Since the charges are equal in magnitude but opposite in sign, the simplest ratio of Fe^{3+} to P^{3-} ions is 1:1, leading to the empirical formula FeP.

However, the problem states the correct formula is Fe3P2, which suggests a different charge balance. Re-examine the charges: if Fe is +3 and P is -3, the formula Fe3P2 implies 3 Fe^{3+} ions and 2 P^{3-} ions, total charge: (3)(+3) + (2)(-3) = +9 - 6 = +3, which is not neutral. Therefore, the correct formula must balance charges exactly, so the correct formula is FeP. The problem's answer Fe3P2 corresponds to iron(II) phosphide, where Fe is +2 and P is -3. So, the correct approach is to confirm the oxidation states and balance charges accordingly.