Question

A liter of water at room temperature (20 degrees * C) is heated to its boiling temperature. How many kilocalories of heat are required?

Answer 1

Answer:

80 kcal

Explanation:

The computation of the kilocalories of heat required is shown below:

As we know that

1 liter of water = 1 kg

Therefore the specific heat of water is C = 1 kcal per kg

Now the heat required is

$Q = M\times C \times \Delta T$

where,

M = 1

C = 1

Delta T = (100 -20)

As we assume that boiling point of water is 100 degrees

Now put this values to the above formula

So, the heat required is

$Q = 1\times 1 \times (100 - 20)$

= 80 kcal