$25.$Fisher$-$Trop synthesis uses syngas conversation to produce jet fuels and other petroleum fuels. If one of the fuels produced from FT process is $8CO+16H_2{C}_8{H}_{16}+8H_{2}O$

This reaction needs $8$ mols of $CO$ and $16$ mols of $H_2$ to make one mole of $C_8{H}_{16}($jet fuel$).$ Syn gas normally consists of $1$mol of $CO$ for every $2$mols of $H_2.$ Calculate how many $kg$ of syngas $($syngas: $CO$:$2H_2)$ to get $1kg$ of jet fuel using FT process.

$26.$Calculate the fuel consumed $($diesel $C_{12}{H}_{23})$ to generate $400lb.ft$ torque at $1600$ rpm for $2$ hours. Assume $30\%$ efficiency and the calorific value of $9800\frac{\text{K}\text{c}\text{a}\text{l}}{\text{l}\text{i}\text{t}\text{e}\text{r}}.$

$27.$Estimate the $C{O}_2$ emission from this fuel $($Ques$.26)$ per $km$ of running.

$28.$If instead of ICE $($Internal combustion Engine$),$ hydrogen is used as fuel with an

efficiency of $50\%($fuel cells$),$ calculate the $H_2$ consumption from the same vehicle running for $2$ hours at constant torque and speed.

What is the saving in $C{O}_2$ emission while running on $H_2$ compared to diesel as fuel. Suppose the cost of diesel is $1$ dollar per liter. Then, at what cost hydrogen will make the cost of running it equal.

$31.$If the cost of green hydrogen is currently at $6$ dollars per $kg,$ then calculate what should be $CO2$ tax to make the cost of running equivalent between $1$ dollar per liter diesel and $6$ dollar $\frac{?}{kg}$ hydrogen.