text: energy/chemistry question - i'm stuck!? a helium-filled balloon at 1.00 atm pressure has a volume of 1.260 l. it is placed in a freezer and its volume decreases, stopping at 0.970 l. (assume that the static internal and external pressures are equal, that the balloon contains only helium, and helium behaves as an ideal gas.) calculate delta e for the gas in the balloon. is this all the information that the question gave? for example, is there any mention of temperature(either the initial or that of the freezer)?  the only thing i can think of is energy = heat + work. and i'm guessing work is done when the volume of the balloon is compressed.