What is the molar mass of AuCl_3?

• A. 197.00 g/mol
• B. 265.50 g/mol
• C. 303.33 g/mol
• D. 232.50 g/mol

Answer: (C)

Verified step by step guidance

1. Identify the elements present in the compound AuCl_3. It contains gold (Au) and chlorine (Cl).
2. Find the atomic masses of each element from the periodic table: gold (Au) has an atomic mass of approximately 197.00 g/mol, and chlorine (Cl) has an atomic mass of approximately 35.45 g/mol.
3. Determine the number of atoms of each element in the formula AuCl_3: there is 1 atom of Au and 3 atoms of Cl.
4. Calculate the total mass contributed by each element by multiplying the atomic mass by the number of atoms: for Au, multiply 197.00 g/mol by 1; for Cl, multiply 35.45 g/mol by 3.
5. Add the total masses of Au and Cl together to find the molar mass of AuCl_3 using the formula: \(\text{Molar mass} = (1 \times 197.00) + (3 \times 35.45)\) g/mol.