Mixtures of hydrocarbons gases and air will burn only if the gas:air ratio is within the flammability limit. For example, propane gas:air mixtures will not ignite, even if exposed to a flame, if the propane composition of the mixture is greater than 11.4 mol%. Calculate the pounds of propane (C3H8) to mix with 100 L of air (at 1 atm pressure and 32 degrees Farenheit) to just exceed the flammability limit and avoid ignition of the propane-air mixture. Air can be umed to be 79mol%N2 and 21mol% O2. The density of air to propane gas can be calculated from the ideal gas law.
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