In a closed system, if 100 J of heat is added to a gas and it does 40 J of work,
Practice Questions
Q1
In a closed system, if 100 J of heat is added to a gas and it does 40 J of work, what is the change in internal energy (ΔU) according to the first law of thermodynamics?
60 J
40 J
100 J
140 J
Questions & Step-by-Step Solutions
In a closed system, if 100 J of heat is added to a gas and it does 40 J of work, what is the change in internal energy (ΔU) according to the first law of thermodynamics?
Step 1: Understand the first law of thermodynamics, which states 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).
Step 2: Identify the values given in the problem: Q = 100 J (heat added) and W = 40 J (work done by the gas).
Step 3: Use the formula ΔU = Q - W to find the change in internal energy.
Step 4: Substitute the values into the formula: ΔU = 100 J - 40 J.
