Question

An ideal gas is enclosed in a piston, and exactly 1200 J of work is done on the gas. As this happens, the internal energy of the gas increases by exactly 700 J. During this process, how much heat flows into or out of the ideal gas? Enter a positive number to indicate a heat flow into the gas or a negative number to indicate a heat flow out of the gas.

Answer 1

Answer:

$dQ=-500J$

Explanation:

We have given work is done on the gas is 1200 J

So work done will be $dW=-1200J$ ( as work is done on the gas )

It is given that internal energy is increases by exactly 700 J

So $dU=700J$

From thermodynamic equation $dQ=dU+dW$

So $dQ=700-1200=-500J$

Here negative sign indicates that heat flow out of the gas

If heat was negative then heal was flowing in the gas