I really have no Idea where to start... Please help 1. The problem statement, all variables and given/known data A monatomic gas is cooled by 50 C at constant volume by removing 830 J of energy. How many moles of the gas is in the sample. 2. Relevant equations ???Q=mc (delta)T 3. The attempt at a solution I am not sure where to start...a monatomic gas could be any of the noble gases, right? each with a different molecular weight and each would have a different specific heat at a constant volume(c). Is this even the right equation to start with. Thanks.