PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
At STP, the temperature is 0°C (273.15 K) and the pressure is 1 atm. We can rearrange the ideal gas law to solve for the volume at STP:
V_STP = (P_STP × V) / (P × T)
Substituting the given values:
V_STP = (1 atm × 720.0 ml) / (3.00 atm × 293.15 K)
V_STP = 240.0 ml
Therefore, the volume of the gas at STP is 240.0 ml.
