One of the ways to dry air is by cooling below the dew point so that some of the moisture condenses. For a certain application it is required to reach an absolute humidity of $0\mathrm{.}002$gr$/$gr$($da$)$

$1.$ If the humid air supply is at a pressure of $200$KPa to what temperature should it be cooled?

$2.$ The humid air supply is at a pressure of $2\mathrm{.}2$ MPa to what temperature should it be cooled?

$3.$ The lowest temperature the cooling device can reach is $-5$C$.$ What is the air pressure range in which it can be used?