Delta U Equation

[Ryan Aung 2I]

What would be the equation fro delta U if there was no volume given and when the pressure is constant?

[Emily_Hanna_2E]

Hi Ryan! Since the change in U equation has to do with heat and work, the work part of the equation corresponds to the pressure times the change in volume. If pressure is constant, you can find the volume using the ideal gas law (PV=nRT) by isolating V and solving for it. However, keep in mind in an isolated system, the energy must remain constant since matter and heat cannot be transferred and the system cannot undergo physical changes, so the change in U will be 0. To answer ur question simply, the equation for the change in U is still q+w, but you will need to do additional steps to solve for the work by replacing it with the ideal gas law (P*delta V=nRT). Hope this helps!