A gas occupies a volume of 5 L at a pressure of 1 atm and a temperature of 273 K. How many moles of gas are present? (R = 0.0821 L·atm/mol·K)

• A. 0.18 moles
• B. 0.22 moles
• C. 0.30 moles
• D. 0.41 moles

Answer: (B)