2. How much heat is released when 432g of water cools down from 710C to 180C?

The heat released by the water when it cools down by a temperature difference AT

is Q = mC, AT

where

m=432 g is the mass of the water

C, = 4.18J/gºC

is the specific heat capacity of water

AT = 71°C - 18°C = 530

is the decrease of temperature of the water

Plugging the numbers into the equation, we find

Q = (4329) (4.18J/9°C) (53°C) = 9.57. 104J

and this is the amount of heat released by the water.