Weak aqueous Sulphuric Acid $(73\%\frac{w}{w}$ is to be concentrated to $93\%\frac{w}{w}$

acid by spraying into hot flue gas at $1$ bar pressure so that the excess water

evaporates. The flue gas is obtained by the complete combustion, with the

stoichiometric amount of air, of a fuel gas of overall composition $(CH{)}_n.$

Sketch a diagram of the process and then calculate the mass of fuel gas required per

$kg$ of concentrated acid produced neglecting heat losses from the concentrator.

Data for Acid

Data for Flue Gas