The lower flammability limit (lfl) for a gas is the minimum, Ask an Expert

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The lower flammability limit (LFL) for a gas is the minimum concentration of the gas, in air, below which there is too little fuel to support combustion; For propane, the LFL is 2.1 mol-%.

(a) How many kg of propane are required to fill a room of dimensions 10 m x 10m x 3m if the final mixture is stoichiometric with air?

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