A stream of hot gases at (1,000^{circ} mathrm{C}), having a specific heat of (6.9 mathrm{cal} / mathrm{mol}-{

Question:

A stream of hot gases at $1,000^{\circ} \mathrm{C}$, having a specific heat of $6.9 \mathrm{cal} / \mathrm{mol}-{ }^{\circ} \mathrm{C}$, is used to preheat air fed to a furnace. Because of insufficient insulation, the hot gas cools to $700^{\circ} \mathrm{C}$ before it enters the air preheater. How much availability per mole does it lose?

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