Question

STP is equal to how many litre

Answer 1

At STP standard temperature is 273 k and standard pressure is one atmosphere. PV = nRT and if n = 1 mole then for STP... 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.

Answer 2

It's 22.4L according to your question