A $1000$m$^(3)$ room contains moist air at $33\backslash$deg C$,102$kPa. The partial pressure of water vapor is $2\mathrm{.}5$ kPa.

a$)$ the relative humidity

b$)$ the humidity ratio, in kg $($vapor$)$ per kg $($dry air$)$

c$)$ the dew point temperature

d$)$ the mass of dry air, in kg