A sample of 0.010 mole of oxygen gas is confined at 127°C and 0.80 atmosphere. What would be the pressure of this sample at 27 degrees C and the same volume?
The pressure will be 0.60 atm.
Since the volume is constant but the pressure and temperature are changing, this is an example of Gay-Lussac's Law:
Your data are:
We can rearrange the above formula to get
The new pressure is 0.60 atm.