If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the

If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the change in internal energy?

If a gas expands and does 50 J of work while absorbing 30 J of heat, what is the change in internal energy?

Step 1: Identify the values given in the problem. The work done by the gas (W) is 50 J, and the heat absorbed by the gas (Q) is 30 J.
Step 2: Recall the formula from the First Law of Thermodynamics, which is ΔU = Q - W. This formula helps us find the change in internal energy (ΔU).
Step 3: Substitute the values into the formula. Here, Q is 30 J and W is 50 J, so we write ΔU = 30 J - 50 J.
Step 4: Perform the calculation. 30 J - 50 J equals -20 J.
Step 5: Conclude that the change in internal energy (ΔU) is -20 J.

First Law of Thermodynamics – The principle that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) minus the work done by the system (W).