# Determining the final temperature from acid base neutralization equation and moles

50 ml of 0.2 M solution of $\ce{HCl}$ is mixed with 75 ml of 0.2 M solution of $\ce{NaOH}$ in a constant pressure calorimeter. The acid base neutralization which occurs can written as:

$\ce{H+_{(aq)} + OH^{-}_{(aq)} -> H2O_{(l)}}$

$\Delta H = -57\ \mathrm{kJ}$

Calculate the final temperature of the reaction mixture (assume the heat capacity of the calorimeter is negligible).

How can I do this problem without an initial temperature?