What is the molar mass of chlorine gas (Cl_2)?

• A. 70.90 g/mol
• B. 44.01 g/mol
• C. 22.99 g/mol
• D. 35.45 g/mol

Answer: (A)

Verified step by step guidance

1. Identify the chemical formula of chlorine gas, which is \(\mathrm{Cl}_2\), meaning it consists of two chlorine atoms bonded together.
2. Find the atomic mass of a single chlorine atom from the periodic table. The atomic mass of chlorine (Cl) is approximately 35.45 g/mol.
3. Since chlorine gas consists of two chlorine atoms, calculate the molar mass by multiplying the atomic mass of chlorine by 2: \(\text{Molar mass of } \mathrm{Cl}_2 = 2 \times 35.45 \ \mathrm{g/mol}\).
4. Perform the multiplication to find the molar mass of chlorine gas (do not calculate the final number here, just set up the expression).
5. Use this molar mass value to compare with the given options and select the correct molar mass of chlorine gas.