Calculate the amount of heat required to completely sublime...

Calculate the amount of heat required to completely sublime 50.0 g of solid dry ice $\left(\mathrm{CO}_{2}\right)$ at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 $\mathrm{kJ} / \mathrm{mol}$ .

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Key Concepts

Molar Mass and Mole Concept

This concept involves converting a given mass of a substance into the number of moles using its molar mass. In thermochemical calculations, determining the number of moles is essential, as many enthalpy values or energy changes are provided on a per mole basis.

Heat of Sublimation

The heat of sublimation represents the amount of energy required to convert one mole of a substance from the solid phase directly to the gas phase without passing through a liquid state. It is an important thermodynamic property used to calculate the total energy needed for a phase transition.

Thermochemical Calculations

These calculations involve applying energy per mole values, such as the heat of sublimation, to the number of moles of a substance to determine the overall energy change. This approach is common in problems requiring the conversion of mass to energy using known enthalpy values.

Phase Transition (Sublimation)

Sublimation is a type of phase transition where a substance transitions directly from the solid phase to the gas phase without becoming liquid. Understanding this process is crucial when analyzing energy requirements and properties of materials like dry ice.

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