Stoichiometry
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules

Do work equal to loss in kinetic energy
Do not lose energy on collision
Do not exert attractive force on each other
Are above the inversion temperature

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Stoichiometry
Pick out the wrong unit conversion of thermal conductivity.

1 BTU/ft².hr.°F/inch = 1.488 kcal/m². hr.°C/m
1 kcal/m.hr.°C = 0.672 BTU/ft.hr.°F = 1.163 W/m. °K
1 BTU/ft².hr.°F/ft = 1.488 kcal/m². hr.°C/m
1 W/cm.°C = 85.985 kcal/m.hr.°C = 57.779 BTU/ft.hr.°F

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