Determine the values for Q$,$ W$,\backslash$Delta U$,$ and $\backslash$Delta H as $2\mathrm{.}00$ g of helium $($molar mass $5$ g$/$mol$)$ exhibiting a molar heat capacity at constant pressure $($CP$,$m$)$ of $(7/2)$R experiences the following processes, assuming ideal gas behavior:

$($a$)$ Undergoes a reversible constant$-$pressure expansion from $21\mathrm{.}0$ to $41\mathrm{.}0$ L at $1\mathrm{.}800$ bar.

$($b$)$ Experiences a reversible heating with pressure increasing from $1\mathrm{.}600$ to $1\mathrm{.}900$ bar while maintaining a fixed volume at $16\mathrm{.}0$ L$.$