Answer to Question #261043 in Physical Chemistry for Miko

Question

A student must use 225 g of hot water in a lab procedure. Calculate the amount of heat required to raise the temperature of 225 g of water from 20.0 ^oC to 100.0^oC.

Answer 1

Heat is the amount of the thermal energy contained in an object measured in joules. When heat energy is transferred to an object, the temperature of the object changes depending on the amount of heat applied and the type of object.

Given that:

mass of water $(m) = 225 g,$

Temperature difference $(∆T) = 100°C - 20°C = 80°C,$

Water’s specific heat capacity $(Cp) = 4.184 J/g°C$

The quantity of heat (Q) is given as:

$Q=mC_p∆T$

$Q=225×4.184×80=75312J=75.312KJ$