How can determine the final temperature of the mixture

Question

Consider the reaction:

2 HCL(aq) + Ba(OH)₂(aq) ---->BaCl₂(aq) + 2H₂O(l) ΔH= -118

Determine the heat when 100 mL of 0.5 M HCl is mixed with the 300mL of 0.1M Ba(OH)₂. Assuming that the final mixture has a mass of 400.0 g, the temperature of both solutions was initially 25 C and a specific heat capacity of 4.18 J/C. g. Determine the final temperature of the mixture.