Laboratory experiment produces volatile compound in gaseous form. You need to collect this sample by adding just enough cryogen (cooling agent) into a rigid vessel to condense your compound as liquid (boiling temperature -23 oC). It is important to keep final pressure at a minimum. You have a choice of dry ice (sublimation from solid to gas at -78.5C (change Sublimation H 25.2kJ/mol, Cp (Co2, gas)= 54.6 J/mol*K) or liquid nitrogen (boiling point -195.8C, Change H vaporization 5.6 kJ/mol, and Cp (NO2, gas)=29.1 J/mol*K) which cryogen should you use?