$89\mathrm{.}60\%C_2{H}_4,6\mathrm{.}72\%N_2,$ and $3\mathrm{.}68\%C{O}_2$

a$)$ Calculate the "calorific value" of the gas mixture.

the gas is burned, calculate the adiabatic flame temperature.

c$)$ What will be the amount of excess air, in order to obtain $2000K$ adiabatic flame

temperature?

d$)$ If $125$ liter of gas was used, what would be the flame temperature? Why? $($Do not calculate;

answer in the form of: would be higher, lower, the same, similar, be $\frac{1}{125}$ th$,125$ times

higher, much lower, much higher, etc$)$

e$)$ If the amount of excess air is decreased from $34\%$ to $17\%,$ would you expect lower, higher or

the same flame temperate? Do not calculate, shortly answer and explain the reason. Plot a

schematic graph for excess air vs flame temperature change.

f$)$ The efficiency of the furnace is $85\%.$ If $1m^3$ of the gas mixture is burned, how many $kg$ of

copper is smelted and tapped at $1450K?$

g$)$ The flue gas temperature is $450C.$ Calculate the amount of total energy released from the

system with the flue gas.

h$)$ Calculate the releasing energy with $1m^3$ of the flue gas.

i$)$ What are the advantages of high specific heat capacity of water? Briefly explain.

Be careful $b$ and $c$ terms are multiplied by ${10}^3$ and ${10}^{-5},$ respectively.

$e.g.C{p}_{C{O}_2}=44\mathrm{.}1+9\mathrm{.}0*{10}^{-3}T-8\mathrm{.}54*{10}^5{T}^{-2}$

$Cu=63\mathrm{.}5\frac{g}{m}ol{H}_{\text{m}\text{e}\text{t}\text{t}\text{i}\text{n}\text{g}\text{,}}Cu=13100\frac{J}{m}ol$