A sample of gas is placed in an ice bath so that there is 10 J of heat transfer out of the sample. At the same time, the gas is compressed by a piston that does 40 J of Work on the gas. What is the change in thermal energy of the gas

Explanation:

Hello,

In this case, we use the equation regarding the first law of thermodynamics which is:

In this case, the want to compute the change in thermal energy of the gas which is related with ΔU. In such a way, since the 10 J are being removed, they are set as negative in the aforesaid equation, moreover, the 40 J of work are positive since it is a work done on the system. Hence:

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