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**1. Homework Statement**

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. Homework 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.