Ideal Gases $-$ Internal Energy and Enthalpy

Consider a process that takes an ideal gas between an initial state $(350.$K$,1\mathrm{.}0$ atm $)$

and a final state $(1000.$ K$,10\mathrm{.}0$ atm $).$ Calculate the specific enthalpy and internal

energy changes $($i$.$e$.,$ per unit mass$)$ for such a process for two substances: $H_2$ and

$H_{2}O.$ Calculate your answer using the following three different approaches:

$($a$)$ assume the specific heats are constants $($i$.$e$.,$ the calorically perfect gas

assumption$)-$ and use a ROOM TEMPERATURE value for the specific heats;

$($b$)$ allow the specific heat to vary with temperature and use the polynomial

expressions for specific heats found in Table D$\mathrm{.}11$;

$($c$)$ use the tabulated values for $u$ and $h$ of the gases found in the appropriate Tables

in your text $($D$.4$ and D$\mathrm{.}7)$