text, $12\mathrm{.}6.$ "Natural gas at $23C,1$ bar enters a furnace with the following molar analysis: $40\%$ propane $(C_3{H}_8),40\%$ ethane $(C_2{H}_6),20\%$ methane $(C{H}_4).$ Determine $($a$)$ the analysis in terms of mass fractions. $($b$)$ the partial pressure of each component, in bar. $($c$)$ the mass flow rate, in $k\frac{g}{s},$ for a volumetric flow rate of $20\frac{m^3}{s}."$

DISCUSSION: Summarize the results using "THE TABLE" $($of course!$),$ including calculation of mass fractions, the mixture $($apparent$)$ molecular weight, and the gas constant $R$ for the mixture.