In what phase is CO2 at 4 atm and -10°C is liquid, gas or solid? Starting from the same point, 4 atm and −10 °C, what phase change would eventually result from an increase in pressure? a. vaporization
b. sublimation
c. freezing
d. deposition
e. melting
f. condensation

(f).Condensation

CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure  

Explanation:

Using The phase diagram of CO2 we observe that

Carbon dioxide at -10degree Celsius and 4atm pressure will be in

Gaseous phase. Starting from the same point, 4atm and -10degree Celsius upon increasing the pressure the Carbon dioxide will change into liquid phase above 5.11atm pressure, this happened due to Condensation.

Therefore CO2 exist as gaseous state at -10degree 4atm pressure and will become liquid upon increasing the pressure till 5.11stm.  

the formula would be mgso4

mgso[subscript]4