How to Calculate Heat Lost or Gained in a Reaction?

[HelloMotto]

0.100 mol/L + 23 ml of Potassium Hydroxide is mixed with 18 ml of hydrobromic acid. Calculate the heat gained or lost by the reaction.

The initial temperature was 20.1 celsius and the final was 24.5 celsius.

i have no clue how to solve this equation. Can someone give me clues and what equation to use?

 

[chemisttree]

The only important information you have is that 41 mL of solution is heated from 20.1 C to 24.5 C. You need the heat capacity and density of that solution (either given or make an assumption) to complete the calculation.

Do you know of a relationship between heat and temperature change, volume (mass?) and heat capacity?