Question

20 sep interpret data use the phase diagram for carbon dioxide (co₂) to determine in which phase co₂ would be at stp. similar to the normal boiling point for water, co₂ will have a normal sublimation point. identify the normal sublimation temperature of carbon dioxide.

Explanation:

STP (Standard Temperature and Pressure) is \(0^{\circ}C\) (273.15 K) and \(1\ atm\). Looking at the phase diagram of \(CO_2\), at \(1\ atm\) and \(0^{\circ}C\), the phase of \(CO_2\) is gas. The normal sublimation point is the temperature at \(1\ atm\) where solid \(CO_2\) directly converts to gas. From the phase diagram, at \(1\ atm\), the temperature at which this occurs is \(-78.5^{\circ}C\).

Answer:

At STP (\(0^{\circ}C\), \(1\ atm\)), \(CO_2\) is in the gas phase. The normal sublimation temperature of \(CO_2\) is \(-78.5^{\circ}C\).