Stoichiometry
Pick out the wrong unit conversion of calorific value.

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

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Stoichiometry
An ideal gas can be liquified, because

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

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