Under STP conditions, what is the approximate molar volume of an ideal gas in liters per mole?

Under STP conditions, what is the approximate molar volume of an ideal gas in liters per mole?

• A. 22.4 L
• B. 24.0 L
• C. 20.0 L
• D. 30.0 L

Answer: (A)

Under STP, the molar volume of an ideal gas is determined by PV = nRT with n = 1 mole, P = 1 atm, and T = 273.15 K. The molar volume is V = RT/P. Using R = 0.082057 L·atm/(mol·K), this gives V ≈ (0.082057)(273.15) ≈ 22.4 L per mole. This is the standard reference value for an ideal gas at 0°C and 1 atm. The other numbers correspond to other conditions: 24.0 L would be at around 25°C, 20.0 L would require higher pressure or a cooler temperature, and 30.0 L would require even lower pressure or higher temperature.

Under STP, the molar volume of an ideal gas is determined by PV = nRT with n = 1 mole, P = 1 atm, and T = 273.15 K. The molar volume is V = RT/P. Using R = 0.082057 L·atm/(mol·K), this gives V ≈ (0.082057)(273.15) ≈ 22.4 L per mole. This is the standard reference value for an ideal gas at 0°C and 1 atm. The other numbers correspond to other conditions: 24.0 L would be at around 25°C, 20.0 L would require higher pressure or a cooler temperature, and 30.0 L would require even lower pressure or higher temperature.