You are conducting a calorimetry experiment using a calorimeter with 500mL of water in its outer chamber to determine the enthalpy of reaction of a chemical reaction. The initial temperature of the water is 25°C. After the reaction, the temperature of the water is 32.5°C. Disregarding any heat loss to the walls of the container, calculate the ΔHr0. The specific heat of water is 4.18 J/(g•K).

Answer choices
A.)ΔHr0= 25.7 kJ
B.)ΔHr0= 45.3 kJ
C.)ΔHr0= 105.8 kJ
D.)ΔHr0= 15.7 kJ
E.)ΔHr0= -140.0 kJ