Question

the normal melting point of water is 0°c. 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. phase diagram of carbon dioxide

Explanation:

Step1: Recall STP conditions

STP means standard - temperature and pressure, where pressure $P = 1$ atm and temperature $T=0^{\circ}C$.

Step2: Locate the point on the phase - diagram

On the phase - diagram of $CO_2$, find the point where $P = 1$ atm on the pressure axis and move horizontally until it intersects with the temperature - pressure curves.

Step3: Determine the phase

At $P = 1$ atm and $T = 0^{\circ}C$, the point lies in the gas phase region of the $CO_2$ phase - diagram.

Step4: Identify the normal sublimation point

The normal sublimation point is the temperature at which $CO_2$ sublimes at 1 atm pressure. From the phase - diagram, when $P = 1$ atm, the solid - gas transition (sublimation) occurs at approximately $- 78.5^{\circ}C$.

Answer:

$CO_2$ is in the gas phase at STP. The normal sublimation temperature of $CO_2$ is approximately $-78.5^{\circ}C$.