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Write the chemical formula for the covalent compound formed from a ratio of two phosphorus atoms to five oxygen atoms using IUPAC nomenclature rules.

39Name the covalent compound P4S3 according to IUPAC nomenclature rules.

40Write the chemical formula for the covalent compound carbon tetrachloride using IUPAC nomenclature rules.

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38. Empirical ratio 2 P : 5 O → molecular formula (IUPAC) P4O10. IUPAC name: tetraphosphorus decoxide (commonly called phosphorus pentoxide).

39. P4S3 — IUPAC name: tetraphosphorus trisulfide.

40. Carbon tetrachloride → formula: CCl4.