Question
Asked Feb 9, 2020
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Calculate the amount of heat required to completely sublime 25.0 grams of solid dry ice (CO2) at its sublimation temperature. The heat of sublimation for CO2 is 32.3 kJ/mol.

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Expert Answer

Step 1

Given information:

Mass of dry ice = 25.0 g

Heat of sublimation of dry ice ΔHsub = 32.3 kJ/mol

 

Step 2

The amount of heat (q) required can be expressed in terms of number of moles (n) and heat of sublimation (ΔHsub) for a given sublimation process. The mathematical expression for this is represented as follows:

Chemistry homework question answer, step 2, image 1

 

Step 3

First number of moles of dry ice will be calculated as follows:

Chemistry homework question answer, step 3, image 1

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