(Solved): To determine the calorimeter constant (Ccal) of their setup, a student decides to mix 75mL of ...

To determine the calorimeter constant $\left({\mathrm{C}}_{\mathrm{cal}}\right)$ of their setup, a student decides to mix $75\mathrm{mL}$ of warm water at $92{}^{?}\mathrm{C}$ with $50\mathrm{mL}$ of cooler water at $21^{?}\mathrm{C}$ that was in the calorimeter. They notice that after mixing the solutions, the final temperature of the system is $49^{?}\mathrm{C}$. What is the calorimeter constant for the system in $\mathrm{J}/{}^{?}\mathrm{C}$ ? Give your answer to the nearest ones place (e.g.: $153\mathrm{J}/{}^{?}\mathrm{C})$