Carbon dioxide sublimes (changes from solid to gas) at 195 K The heat of sublimation is 573 kJ/k

Name: Problem 28, Chapter 17: Essential University Physics
Uploaded: 2020-06-04T06:11:31-08:00
Duration: 1 min 12 s
Channel: Farnaz Mohseni
Description: Carbon dioxide sublimes (changes from solid to gas) at 195 K The heat of sublimation is 573 kJ/kg. How much heat must be extracted from 250 g of CO2 gas at 195 K in order to solidify it?

step 1 So we know that Q is equal to M times L. Now in the question, we know that the heat of sublimati

Question

Carbon dioxide sublimes (changes from solid to gas) at $195 \mathrm{K}$ The heat of sublimation is 573 kJ/kg. How much heat must be extracted from $250 \mathrm{g}$ of $\mathrm{CO}_{2}$ gas at $195 \mathrm{K}$ in order to solidify it?

   Carbon dioxide sublimes (changes from solid to gas) at $195 \mathrm{K}$ The heat of sublimation is 573 kJ/kg. How much heat must be extracted from $250 \mathrm{g}$ of $\mathrm{CO}_{2}$ gas at $195 \mathrm{K}$ in order to solidify it?

Essential University Physics

Richard Wolfson 3rd Edition

Chapter 17, Problem 28

Instant Answer

Solved by Expert Farnaz Mohseni

06/04/2020

Step 1

The heat of sublimation (L) is given as 573 kJ/kg, which is equal to $573 \times 10^{3}$ J/kg. The mass (m) of the CO$_{2}$ gas is given as 250 g, which is equal to $250 \times 10^{-3}$ kg. Show more…

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Carbon dioxide sublimes (changes from solid to gas) at $195 \mathrm{K}$ The heat of sublimation is 573 kJ/kg. How much heat must be extracted from $250 \mathrm{g}$ of $\mathrm{CO}_{2}$ gas at $195 \mathrm{K}$ in order to solidify it?

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Key Concepts

Mass-to-Energy Conversion

This involves the calculation of energy exchanged during a phase change by multiplying the mass of the substance by its specific latent heat. Understanding how to perform such conversions is essential in thermodynamics for relating the macroscopic mass of a material to the energy involved in its phase transition.

Latent Heat of Sublimation

This concept refers to the amount of energy required per unit mass to change a substance directly from its solid phase to its gaseous phase (or vice versa) without a change in temperature. It is crucial for determining the energy exchange during phase transitions like sublimation.

Phase Transition

Phase transitions involve the change of matter from one state to another (solid, liquid, gas) and require an exchange of energy. In this context, the transition from gas to solid requires removing the latent heat associated with sublimation, highlighting the importance of phase change thermodynamics.

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