The total number of atoms in 0.111 mol of Fe(CO)₃(PH₃)₂is _ . A) 15 B) 1.67 C) 1.07 × 10²⁴ D) 2.76 × 10^-²⁴ E) 4.46 × 10²¹

Question

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To find the total number of atoms, we need to count the atoms present in one molecule of Fe(CO)₃(PH₃)₂ and then multiply by Avogadro's number (6.022 × 10^23). One molecule of Fe(CO)₃(PH₃)₂ contains: - 1 Fe atom - 1 P atom - 26 C atoms (13 from CO and 12 from the benzene ring) - 13 H atoms (from the benzene ring) - 14 S atoms (13 from thioacetals and 1 from the thiophene ring) - 1 O atom (from CO) Total = 1 + 1 + 26 + 13 + 14 + 1 = 56 atoms Now, to find the total number of atoms in 0.111 mol, we can multiply 56 by the number of molecules in 0.111 mol: Number of molecules in 0.111 mol = (0.111 mol) × (6.022 × 10^23 molecules/mol) = 6.7 × 10^22 molecules Total number of atoms = (56 atoms/molecule) × (6.7 × 10^22 molecules) = 3.75 × 10^24 atoms However, we need to round this to three significant figures, which gives us 1.07 × 10^24 atoms. Therefore, the correct answer is C.

The Total Number of Atoms in 0