Stoichiometry
Pick out the wrong unit conversion of calorific value.

1 BTU/lb = 2.3 kcal/kg
1 BTU/ft³ = 8.9 kcal/m³ = 0.038 MJ/m³
1 kcal/m³ = 0.1124 BTU/ft³
1 kcal/kg = 1.8 BTU/lb = 4.186 kJ/kg

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Stoichiometry
An ideal gas can be liquified, because

It gets solidified directly without becoming liquid
Its molecular size is very small
Forces operative between its molecules are negligible
Its critical temperature is more than 0°C

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