chem question properties of gases?

Question

Choose the correct statement from the following:




a. At the temperature of liquid nitrogen argon will also be in the liquid state.
b. CO2 never exists as a liquid, as it always changes directly from solid to gas.
c. In the experiment to be performed if both Ar and CO2 were allowed to reach the temperature of liquid nitrogen, both would sublime when removed from the liquid nitrogen.
d. The triple point has the lowest temperature and pressure coordinates at which the liquid state can exist

Answer 1

a. Nitrogen is liquid at -196 °C
Argon is liquid at - 185 °C
Ar will not be liquid at - 196 °C

b.
CO2 may exist as a liquid at - 57 °C under pressure
c. true
d. The triple point of a substance is the temperature and the pressure at which 3 phases of that substance may coexist in therodynamic equilibrium

Answer 2

A) Yes, argon has a boiling temperarure higher than hydrogen

B) Yes, at atmospheric pressure, CO2 can not be liquid

C) not sure but it seems likely since the temperatue of melting and boiling are vey near

D)no ,it is the higher temperature