Which of the following is the molar mass of chlorine gas (Cl_2)?

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

Answer: (B)

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, which is approximately 35.45 g/mol.
3. Calculate the molar mass of chlorine gas by multiplying the atomic mass of chlorine by 2, since there are two chlorine atoms in \(\mathrm{Cl}_2\).
4. Write the formula for molar mass of chlorine gas as: \(\text{Molar mass of } \mathrm{Cl}_2 = 2 \times 35.45\ \mathrm{g/mol}\).
5. Perform the multiplication to find the molar mass of chlorine gas, which will give you the correct answer.