## 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

Question

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.

in progress 0
2 months 2021-07-23T00:43:30+00:00 1 Answers 3 views 0

1. Answer: 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

• For process 1:

We are given: Putting values in equation (i), we get: • For process 2:

We are given: Putting values in equation (i), we get: • For process 3:

We are given: Putting values in equation (i), we get: • For process 4:

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.