Sixty pounds of carbon dioxide gas are contained in a 100-ft3 rigid, insulated vessel initially at 4 atm. An electric resistor of negligible mass transfers energy to the gas at a constant rate of 12 Btu/s for 40 seconds. Use the ideal gas model and ignore the effects of motion and gravity. Let To = 70°F, po = 1 atm.
-Determine the change in exergy of the gas, in Btu.
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