Respuesta :
Answer:
Gas
Increase the pressure
Explanation:
Let's refer to the attached phase diagram for CO₂ (not to scale).
At -57 °C and 1 atm, carbon dioxide is in which phase?
If we look at the intersection between -57°C and 1 atm, we can see that CO₂ is in the gas phase.
At 10°C and 2 atm carbon dioxide is in the gas phase. From these conditions, how could the gaseous CO₂ be converted into liquid CO₂?
Since at 10°C and 2 atm carbon dioxide is below the triple point, the only way to convert it into liquid is by increasing the pressure (moving up in the vertical direction).

At -57 °C and 1 atm, carbon dioxide is in the gaseous phase.
From these conditions, the way in which the gaseous C02 be converted into liquid CO2 is by increasing the pressure
Calculations and Explanations:
Based on the complete question which has the diagram, we can note that at -57 °C and 1 atm, carbon dioxide is in the gaseous phase because of the pressure and temperature intersection.
Also, the pressure axis on the given graph shows that at 10°C and 2 atm carbon dioxide is below the triple point, and to make the conversation to liquid would be to increase the pressure.
Read more about gaseous phase here:
https://brainly.com/question/24583931