Using the phase diagram for CO2, what phase is carbon dioxide in at -70°C and 1 atm pressure?

A. It is in the liquid phase.

B. It is in the solid phase.

C. It is at its melting point.

D. It is in the gas phase.

A

Explanation:

The Phase Diagram of Carbon Dioxide

At 1 atm, therefore, solid CO2 sublimes directly to the vapor while maintaining a temperature of −78.5°C, the normal sublimation temperature. Solid CO2 is generally known as dry ice because it is a cold solid with no liquid phase observed when it is warmed.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

the answer is   c.) 1575 j.

explanation: