Answer to Question #207991 in General Chemistry for ARKHYE

Question #207991

1. You have ice at 263 K (-10.0oC) and 1.0 atm. What could you do to make the ice sublime?

2. A sample of dry ice (solid CO2) is cooled to 173 K (-100.0oC) and is set on a table at room temperature (298 K; 25oC). At what temperature is the rate of sublimation and deposition the same (assume that pressure is held constant at 1 atm)?

Expert's answer

1. The temperature at which these processes occur at 1 atm pressure is 194.65 K. The temperature at which the rate of sublimation and deposition are the same is the temperature at which these two processes are in equilibrium (this temperature is the freezing point, or sublimation point of CO2).

2. 298 + 173

= 571

= 571/2

= 285.5 K

285.5 - 273

= 8.5°C

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