How many moles of air are there any 3L container at one ATM?

To calculate the number of moles of air in a 3L container at 1 ATM, we can use the ideal gas law: ( PV = nRT ). Here, ( P ) is the pressure (1 ATM), ( V ) is the volume (3 L), ( R ) is the ideal gas constant (0.0821 L·ATM/(K·mol)), and ( T ) is the temperature in Kelvin (assumed to be around 273 K for standard conditions). Rearranging the formula gives ( n = \frac{PV}{RT} ), which results in approximately 0.13 moles of air in the container at standard temperature and pressure.