temperature has increased
Ideal Gas Law:
pressure * volume = (number of moles of gas) * (0.08206) * (temperature)
or short-hand:
PV = nRT
this equation can be transformed to solve for temperature as:
T = PV / nR
given there is no change in pressure and the volume of the container has increased, we know the temperature increases because volume is in the numerator--a larger number on top reflects an overall greater number.
