78. A sample consisting of CO2(g) and CO2(s) at equilibrium at and 1 atm pressure is heated to –78°C –30°C, and the pressure is increased to 8 atm. Based on the phase diagram below, what will happen? A) At equilibrium, only CO2(g) will be present. B) All the CO2 will be converted to CO2(l). C) At equilibrium, CO2(g) and CO2(l) will be present. D) The melting point of the CO2(s) will decrease. E) none of these 79. The triple point of a substance is A) the point at which its solid, liquid, and vapor are all in equilibrium. B) the point at which the vapor pressure of the solid is 1 atm. C) the point at which the liquid starts to condense as the temperature of the vapor is lowered. D) the point at which the density of the solid and the liquid are equal. E) none of 80. Below is a phase diagram for compound X. What is the normal boiling point of X is most likely to be? A) 15° C B) 47° C C) 73° C D) 18° C E) 0° C
78. A sample consisting of CO2(g) and CO2(s) at equilibrium at –78°C and 1 atm pressure is heated to –30°C, and the pressure is increased to 8 atm. Based on the phase diagram below, what will happen? A) At equilibrium, only CO2(g) will be present. B) All the CO2 will be converted to CO2(l). C) At equilibrium, CO2(g) and CO2(l) will be present. D) The melting point of the CO2(s) will decrease. E) none of these 79. The triple point of a substance is A) the point at which its solid, liquid, and vapor are all in equilibrium. B) the point at which the vapor pressure of the solid is 1 atm. C) the point at which the liquid starts to condense as the temperature of the vapor is lowered. D) the point at which the density of the solid and the liquid are equal. E) none of 80. Below is a phase diagram for compound X. What is the normal boiling point of X is most likely to be? A) 15° C B) 47° C C) 73° C D) 18° C E) 0° C
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