PF5
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The formula for tetraphosphorus trisulfide is P4S3. This compound contains 4 phosphorus atoms and 3 sulfur atoms, thus the formula reflects the ratio of elements in the compound.
The chemical formula for chromium(III) phosphite is CrPO3. To write it out, you would indicate the cation first (Cr3+) followed by the anion (PO3-).
P4 (s) + 6Cl2 (g) -> 4PCl3 (l)
To write the chemical formula for the covalent compound formed by chlorine atoms (Cl), you would write "Cl₂" since chlorine forms a diatomic molecule. The formula Cl₂ indicates that two chlorine atoms are covalently bonded together.
P2O5 Reason: di means two. So, diphosphorus means there are two phosphorus atoms. Penta means five. So, pentoxide means there are five oxygen atoms. That's how you get P2O5.