STP means standard temperature-273.15K and pressure 101.325 kPa.

Given

Pressure P=1.01Pa

Number of moles n=1

Temperature T=273.15K

We know ideal gas equation

PV=nRT

Where V= volume of gas

R=gas constant =8.3JK^-1mol^-1

T=temperature

n=number of moles of gas

P=pressure of gas.

So, we can write

The volume of 1 mole of an ideal gas at STP=0.0224m³.