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2. Evaluate the change in specific enthalpy, in $\mathrm{kJ} / \mathrm{kg}$, for air from a state where the temperature is $400 \mathrm{~K}$ to a state where the temperature is $900 \mathrm{~K}$. Compute this change (a) using the ideal gas tables (VSH = variable specific heats), (b) a constant specific heat ( $\mathrm{CSH})$ evaluated at the average temperature for the process, and (c) using a constant specific heat (CSH) at $300 \mathrm{~K}$. Comment on the relative error between these estimates. 3. Evaluate the change in specific internal energy, in $\mathrm{kJ} / \mathrm{kg}$, for carbon dioxide from a state where the temperature is $300 \mathrm{~K}$ to a state where the temperature is $650 \mathrm{~K}$. Compute this change (a) using the ideal gas tables (VSH = variable specific heats), (b) a constant specific heat $(\mathrm{CSH})$ evaluated at the average temperature for the process, and (c) using a constant specific heat (CSH) at $300 \mathrm{~K}$. Comment on the relative error between these estimates.

Number 3

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