Question

Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the...

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 88 ∘C.

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

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 27 ∘C. Assume no heat loss to the surroundings.

Homework Answers

Answer #1

Amount of water = 15.0 L

Density of water = 1..0 g / ml

Therefore 15.0 L water = 15.0 kg of water

1 .00 kg = 1000 g


heat needed to raise one gram water, one degree celsius = 4.18J

4.18J * 15,000g = 62,700J = 62.7 kJ needed per degree C

Temperature difference= 88 ∘C - 27 ∘C

= 61∘C


62.7 kJ / ∘C * 61∘C = 3824.7 kJ needed from CO2

The ΔH∘f for CO2(s) is - 427.4kJ/mol

Molar mass CO2 = 44g/mol = 22.73 moles/kg


427 kJ/mol * 22.73 moles/kg
= 9704.5 kJ/kg

3824.7 kJ / 9704.5 kJ/kg

= 0.394 kg of CO2 needed

= 394 g of CO2 needed

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the...
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,...
Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the...
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,...
Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the...
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,...
Dry ice is solid carbon dioxide. A 1.75−g sample of dry ice is placed in an...
Dry ice is solid carbon dioxide. A 1.75−g sample of dry ice is placed in an evacuated 4.57−L vessel at 20.0°C. Calculate the pressure inside the vessel after all the dry ice has been converted to CO2 gas.
Dry ice is simply frozen carbon dioxide (carbon dioxide in the solid state) and is pretty...
Dry ice is simply frozen carbon dioxide (carbon dioxide in the solid state) and is pretty cold with a temperature of -109.3 degrees F (-78.5 degrees C). For comparison, liquid nitrogen is MUCH colder at -321 degrees Fahrenheit (-196 degrees Celsius). The carbon dioxide in dry ice will also go directly from the solid state (frozen carbon dioxide) to the gaseous state You have 2.44 grams of dry ice in a 6.0 Liter container maintained at 31.2O C. What is...
a piece of dry ice (solid carbon dioxide) with a mass of 20.0 g is placed...
a piece of dry ice (solid carbon dioxide) with a mass of 20.0 g is placed in a 25.0 L vessel that already contains air at 50.66 kPa and 25C after the carbon dioxide has totally sublimed what is the partial pressure of the resultant CO2 gas, and the total pressure in the container at 25 C?
Below the triple point (-56.6°C) the vapor pressure of solid CO2 (also known as “dry ice”)...
Below the triple point (-56.6°C) the vapor pressure of solid CO2 (also known as “dry ice”) is given as: ln p = -3116/T + 16.01 The molar heat of melting of CO2 is 8330 J. Use just the data given here about CO2. State any assumptions you need to make to answer the following questions. (a) Calculate the vapor pressure exerted by the liquid CO2 at 25°C. (b) Explain why solid CO2 sitting on a laboratory bench evaporates rather than...
What was the reason for the addition of H2O (10 ml), followed by gentle heating? Draw...
What was the reason for the addition of H2O (10 ml), followed by gentle heating? Draw a mechanism equation for the reaction taking place. Why was the water added slowly and through the condenser? Here is my experiment... Experimental procedure Warning: acetic anhydride is corrosive and a lachrymator. When carrying it across the lab, when it is inside a flask, please temporarily stopper the flask. Reaction Place salicylic acid (200 mg = 0.200g) into a dry 25ml round bottom flask...