The vapor pressure of solid CO2 (dry ice) is 280. torr at −90. °C and 105 torr at −100. °C. (a) What is the value of ΔG° for the reaction CO2(s) CO2(g) at each temperature? ΔG° at −90 °C 1.52 kJ/mol ΔG° at −100 °C 2.85 kJ/mol (b) What are ΔH° and ΔS° for the reaction CO2(s) CO2(g) at these temperatures? Assume that ΔH° and ΔS° are constant over this temperature range. ΔH° 26 kJ/mol ΔS° J/K·mol need delta S not (c) A dry ice bath is used routinely in the laboratory to keep things cold. It is made by making a power of the dry ice and then mixing the powder with a solvent to make a slurry. Estimate the temperature of the dry ice bath by determining the temperature at which the vapor pressure of CO2 is 1 atm.
The vapor pressure of solid CO2 (dry ice) is 280. torr at −90. °C and 105 torr at −100. °C. (a) What is the value of ΔG° for the reaction CO2(s) CO2(g) at each temperature? ΔG° at −90 °C 1.52 kJ/mol ΔG° at −100 °C 2.85 kJ/mol (b) What are ΔH° and ΔS° for the reaction CO2(s) CO2(g) at these temperatures? Assume that ΔH° and ΔS° are constant over this temperature range. ΔH° 26 kJ/mol ΔS° J/K·mol need delta S not (c) A dry ice bath is used routinely in the laboratory to keep things cold. It is made by making a power of the dry ice and then mixing the powder with a solvent to make a slurry. Estimate the temperature of the dry ice bath by determining the temperature at which the vapor pressure of CO2 is 1 atm.
Chapter17: Spontaneity, Entropy, And Free Energy
Section: Chapter Questions
Problem 4RQ: The free energy change, G, for a process at constant temperature and pressure is related to Suniv...
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The vapor pressure of solid CO2 (dry ice) is 280. torr at −90. °C and 105 torr at −100. °C.
(a) What is the value of ΔG° for the reaction CO2(s) CO2(g) at each temperature?
(b) What are ΔH° and ΔS° for the reaction CO2(s) CO2(g) at these temperatures? Assume that ΔH° and ΔS° are constant over this temperature range.
need delta S not
(c) A dry ice bath is used routinely in the laboratory to keep things cold. It is made by making a power of the dry ice and then mixing the powder with a solvent to make a slurry. Estimate the temperature of the dry ice bath by determining the temperature at which the vapor pressure of CO2 is 1 atm.
| ΔG° at −90 °C | 1.52 kJ/mol |
| ΔG° at −100 °C | 2.85 kJ/mol |
(b) What are ΔH° and ΔS° for the reaction CO2(s) CO2(g) at these temperatures? Assume that ΔH° and ΔS° are constant over this temperature range.
| ΔH° | 26 kJ/mol |
| ΔS° | J/K·mol |
(c) A dry ice bath is used routinely in the laboratory to keep things cold. It is made by making a power of the dry ice and then mixing the powder with a solvent to make a slurry. Estimate the temperature of the dry ice bath by determining the temperature at which the vapor pressure of CO2 is 1 atm.
(only need delta s part and part c please)
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