Question

What is the total amount of energy absorbed by the substance as it completely changes from a solid at 40°C to a gas at 200°C?

Option 1: It varies depending on the substance.
Option 2: 100 kJ
Option 3: 200 kJ
Option 4: 400 kJ

Answer 1

The total energy absorbed during the phase change from solid to gas at specified temperatures depends on the substance's specific heat, heat of fusion, and heat of vaporization, and thus, it varies depending on the substance.

Step-by-step explanation:

The total amount of energy absorbed by a substance as it changes from a solid at 40°C to a gas at 200°C is dependent on several factors unique to the substance in question. This includes the specific heat of the substance, heat of fusion, and heat of vaporization. These factors determine the amount of energy required for each step of the phase change, including raising the temperature of the solid to its melting point, melting the solid into a liquid, heating the liquid to its boiling point, and vaporizing the liquid into a gas. The latent heat coefficient is crucial in these calculations as it defines the heat transferred during the change of phase for the substance by mass. So, the correct answer to the student's question is:

Option 1: It varies depending on the substance.