What is the molar mass of a gas if 285 mL of the gas weighs 2.33 g at STP?

• A. 175 g • mol^-1
• B. 63.3 g • mol^-1
• C. 183 g • mol^-1
• D. 20.0 g • mol^-1
• E. 200 g • mol^-1

Answer: (C)