10 moles of an ideal gas at \(37^{\circ} \mathrm{C}\) are allowed to expand isothermally from an initial pressure of \(15 \mathrm{~atm}\) to a final pressure of \(5 \mathrm{~atm}\) against a constant external pressure of \(1 \mathrm{~atm}\). Calculate \(\Delta U, \Delta H, Q\), and \(W\) for the process.