Calculate $$H of the reversible, adiabatic process by which $1\mathrm{.}0$ kg of H$2($at $25$ degrees celcius$)$ is compressed to $690$ bar $(11$ liters$).$ Will there be a phase change?

$($a$)$ use PV$=$nRT

$($b$)$ use Redlich$/$Kwong Equation

$($c$)$ use Lee$/$Kesler correlation