The solidified carbon dioxide, dry ice, is used as the refrigerant
to temperatures of 78 °C order
What physical state of carbon dioxide at 25°C and 1 atm?
gas.
Note you should have said -78C and not +78 C.
At 25C and 1 atm it is a gas.
To determine the physical state of carbon dioxide (CO2) at a specific temperature and pressure, we can consult a phase diagram for CO2.
A phase diagram shows the different states of a substance (solid, liquid, or gas) under different combinations of temperature and pressure. The phase diagram for CO2 is commonly known as the "CO2 phase diagram" or the "carbon dioxide phase diagram."
Here's how to use the phase diagram to determine the physical state of CO2 at 25°C and 1 atm:
1. Look up the CO2 phase diagram - You can find the CO2 phase diagram online or in textbooks that discuss thermodynamics or phase behavior.
2. Locate the temperature and pressure values - On the phase diagram, find the point corresponding to the given temperature (25°C) and pressure (1 atm). The point might be represented by a dot or marked with specific labels.
3. Identify the phase at that point - Once you find the point on the phase diagram, determine the corresponding phase. The most common phases are solid (represented by an "s"), liquid (represented by an "l"), and gas (represented by a "g").
Based on the CO2 phase diagram, at 25°C and 1 atm, carbon dioxide is in its gaseous phase (CO2g).