Calculate the total energy, in kilojoules, that is needed to turn a 46 g block of ice at -25 degrees C into water vapor at 100 degrees C.

The amount of heat absorbed is 141.004 kJ.

Explanation:

In order to calculate the amount of heat released while converting given amount of steam (gaseous state) to ice (solid state), few processes are involved:

(1):

(2):  

(3):

(4):

Calculating the heat absorbed for the process having the same temperature:

      ......(i)

where,

q is the amount of heat absorbed, m is the mass of sample and is the enthalpy of fusion or vaporization

Calculating the heat released for the process having different temperature:

     ......(ii)

where,

= specific heat of solid or liquid

are final and initial temperatures respectively

We are given:

Putting values in equation (i), we get:

We are given:

Putting values in equation (i), we get:

We are given:

Putting values in equation (i), we get:

We are given:

Putting values in equation (i), we get:

Calculating the total amount of heat released:

                 (Conversion factor: 1 kJ = 1000J)

Hence, the amount of heat absorbed is 141.004 kJ.

the molecules move in straight line until they collide with each other or with the walls of the container. collisions are perfectly elastic; when two molecules collide, they change their directions and kinetic energies, but the total kinetic energy is conserved.

explanation:

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