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4) Natural gas containing a mixture of methane, ethane, propane, and butane is burned in a furnace with excess air. One hundred kmolfh of a gas...

4) Natural gas containing a mixture of methane, ethane, propane, and butane is burned in a furnace with excess air.

a. One hundred kmolfh of a gas containing 94.4 mole% methane, 3.40% ethane, 0.60% propane, and 0.50% butane is to be burned with 17% excess air. Calculate the required molar flow rate•of the air.
b. Let
nt(kmol/h) = molar flow of the fuel gas
x1, x2, x3, X4, = mole fractions of methane, ethane, propane, and butane, respectively, in the fuel
Pxs = percent excess air
na(kmol/h) = molar flow rate of the air fed to the furnace

Derive an expression for na in terms of the other variables. Check your formula with the results of part (a).

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