What is the molar volume at NTP and STP ? In a book its written both are 22.4L how come ?

Question

In other books its written 22.7 for stp and 22.4 for ntp...pls help !

Answer 1

STP = Standard Temperature and Pressure

T = 273.15K

P = 1 bar = 100 kPa = 0.987 atm

 

NTP = Normal Temperature and Pressure

T = 20ºC = 293.15K

P = 101.325 kPa = 1 atm

 

PV = nRT and if n = 1 mole then for STP...

Using R = 0.0821 L-atm/K-mole

V = nRT/P = (1mol)(0.0821 L-atm/K-mol)(273K)/0.987 atm = 22.7 liters or 22.4 liters if you round P to 1 atm.

 

For NTP...

V = nRT/P = (1 mol)(0.0821 L-atm/K-mol)(293K)/1 atm = 24.05 liters