Question

How much heat in kcal must be added to 0.65 kg of water at room temperature (20°C) to raise its temperature to 43°C? kcal

Answer 1

Given data:

* The mass of the water is 0.65 kg.

* The initial temperature of the water is 20 degree celsius.

* The final temperature of the water is 43 degree celsius.

Solution:

The amount of heat added to the water to increase its temperature is,

`Q=\text{mcdT}`

where m is the mass, c is the specific heat, and dT is the change in the temperature,

Substituting the known values,

`\begin{gathered} Q=0.65*1*(43^(\circ)-20^(\circ)) \\ Q=14.95\text{ kcal} \end{gathered}`

Thus, the amount of heat added to the water is 14.95 kcal or approximately 15 kcal.