Problem: Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the following equation: CO2 (s) → CO2 (g). When dry ice is added to warm water, heat from the water causes the dry ice to sublime more quickly. The evaporating carbon dioxide produces a dense fog often used to create special effects. In a simple dry ice fog machine, dry ice is added to warm water in a Styrofoam cooler. The dry ice produces fog until it evaporates away, or until the water gets too cold to sublime the dry ice quickly enough. Suppose that a small Styrofoam cooler holds 15.0 liters of water heated to 90°CPart A Use standard enthalpies of formation to calculate the change in enthalpy for dry ice sublimation. (The ΔH°f for CO2 (s) is -427.4 kJ/mol)

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CO2 (s) → CO2 (g)

ΔH°rxn = ΔH°f, product - ΔH°f, reactant


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Problem Details

Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the following equation: CO2 (s) → CO2 (g). When dry ice is added to warm water, heat from the water causes the dry ice to sublime more quickly. The evaporating carbon dioxide produces a dense fog often used to create special effects. In a simple dry ice fog machine, dry ice is added to warm water in a Styrofoam cooler. The dry ice produces fog until it evaporates away, or until the water gets too cold to sublime the dry ice quickly enough. Suppose that a small Styrofoam cooler holds 15.0 liters of water heated to 90°C

Part A Use standard enthalpies of formation to calculate the change in enthalpy for dry ice sublimation. (The ΔH°f for CO2 (s) is -427.4 kJ/mol)

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