3. Dry ice is the name for solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the equation: 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 simple dry ice fog machines, 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. A small Styrofoam cooler holds 15.0 L of water heated to 85 °C. Use standard enthalpies of formation to calculate the mass of dry ice that should be added to the water so that the dry ice completely sublimes away when the water reaches 25 °C. Assume no heat loss to the surroundings. (The AH for CO214) is -427.4 kJ/mol.)
3. Dry ice is the name for solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the equation: 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 simple dry ice fog machines, 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. A small Styrofoam cooler holds 15.0 L of water heated to 85 °C. Use standard enthalpies of formation to calculate the mass of dry ice that should be added to the water so that the dry ice completely sublimes away when the water reaches 25 °C. Assume no heat loss to the surroundings. (The AH for CO214) is -427.4 kJ/mol.)
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Chapter6: Thermochemisty
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Problem 6.159QP: The carbon dioxide exhaled in the breath of astronauts is often removed from the spacecraft by...
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Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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Transcribed Image Text:3. Dry ice is the name for solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to
the equation:
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 simple dry ice fog
machines, 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. A small Styrofoam cooler holds
15.0 Lof water heated to 85 °C. Use standard enthalpies of formation to calculate the mass of dry ice that
should be added to the water so that the dry ice completely sublimes away when the water reaches 25 °C.
Assume no heat loss to the surroundings. (The AH°; for CO219) is -427.4 kl/mol.)
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