How many calories are released when 500 g of water cools from 95.0°c to 25.0°c?

                  35,000 cal  will released.

Explanation:

By definition 1 kcal (=1000 calorie) is the approximate amount of energy released when the temperature of 1.000 kg of water is lowered by 1.000 °C (at a pressure of one atm.). It is about 4.2 kJ of energy.

                                   q = mC∆T

where q = heat (calories);      m = mass (500g);        C = specific heat (1 cal/g/deg);           ∆T = change in temp.                                                                                                    Thus,

              q = (500 g)(1 cal/g/deg)(95-25) = (500)(1)(70) = 35,000 cal

beta decay is the answer