250. J are given off.
You actually need to know the specific heat of gaseous neon in order to be able to calculate the amount of heat released when that much neon is cooled from
The specific heat of neon is listed as
A substance's specific heat tells you how much heat is needed/given off to increase/decrease the temperature of one gram of that substance by
The equation that links added/released heat and change in temperature looks like this
Since the temperature of the sample is dropping, you should expect
Rounded to three sig figs, the answer will be