Answer:
The number of mol of oxygen is 0, 123
Explanation:
We use the formula PV=nRT. We convert the temperature in Celsius into Kelvin. 0°C=273 K---> 25°C=273+25= 298K
PV=nRT---> n=(PV)/(RT)
n= (1,20 atm x2,50 L)/(0,082 l atm/ K mol x 298K)
n=0,122769684 mol
