The STP equation is Pressure , P = 1 atm , Temperature , T = 273.15 K.
The ideal gas equation is given as :
P V = n R T
where,
P = pressure of the gas = 1 atm
V = volume of the gas
n = 1 mol
R = constant = 0.823 atm L / mol K
T = temperature = 273.15 K
V = n R T / P
V = (1 × 0.082 ×273.15 ) / 1
V = 22.4 L
thus, at STP , that is standard temperature and the pressure, the volume is 22.4 L.
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