"Chlorine gas and steam are produced through oxidation of hydrogen chloride in a fixed$-$bed reactor using a new RuO$2/$TiO$2$ catalyst. The feed stream to the reactor consist of $60$ mole $\%$ of hydrogen chloride and $40$ mol $\%$ oxygen enter the reactor at $400$C$.$ During the reaction process only $70\%$ of hydrogen chloride was converted to the products. The product leaves the reactor at $550$C$.$ Determine the total heat lost from the reactor per mole of the entering gas mixture. $($heat of formation method$)$

QUESTION $2[20]$

Determine the molar volume $($in m$3/$mol$)$ of saturated liquid and the molar volume of saturated vapor of isobutane at $90$C and Psat of $16\mathrm{.}54$ bar using a suitable method.

$(10)$

A $40$ m$3$ tankPG$13$ contains $40\%$ of liquid n$-$butane in equilibrium with its vapor at $25$C$.$ Estimate the mass of n$-$butane vapor and liquid in the tank. The vapor pressure of n$-$butane at the given temperature is $2\mathrm{.}43$ bar.

$(10)"$