A student uses the constant-volume calorimeter shown to determine the standard molar enthalpy of combustion, \(\Delta H_{\text{comb}}^\circ\), of a solid fuel. A \(0.0100\text{ mol}\) sample of the fuel is placed in the reaction chamber and completely combusted in excess oxygen. The student records the temperature increase, \(\Delta T\), of the \(1000\text{ g}\) of surrounding water. In the calculations, the student assumes all heat released by the combustion is absorbed solely by the water (\(q_{\text{absorbed}} = m_{\text{water}} c_{\text{water}} \Delta T\)) and neglects the heat capacity of the calorimeter vessel and internal components, \(C_{\text{cal}}\).

Which of the following correctly predicts the effect of this assumption on the calculated \(\Delta H_{\text{comb}}^\circ\) and identifies the appropriate experimental procedure to determine \(C_{\text{cal}}\)?