Choose the correct answers from the options given below.

We need to design a reactor in which the following steam reforming of methane is being done to produce hydrogen as per the following reaction:

$C{H}_4+H_{2}O+206k\frac{J}{m}olof$ heat longrightarrowCO$+3H_2$

The reaction is endothermic and is to be carried out at high temperatures $(800C)$ based on the desired output composition. All the species are in gas phase

but the reaction is catalytic. Reactants will have to diffuse to the catalyst which is coated on the bottom wall of the reactor$($see Figure $1)$ between planes $B$ and

$C$ which are at a distance of $0\mathrm{.}5L$ and $0\mathrm{.}75L,$respectively. The reactants are heated to the desired temperature by heating the gas mixture over the length of

the traverse between planes A and B$.$ Further heating needs to be between planes B and C to provide thermal energy for the endothermic reaction.

For a given reactor of length $L,$ height $H$ and width $W,$ flow rate and composition at the inlet and thermal wall boundary conditions on the bottom wall, we need

to find out how much conversion takes place, i$.$e$.,$ how much of the $C{H}_4$ coming through the inlet gets converted to $H_2.$ We want to find this out using $CFD$

simulation. To begin with, assuming

Assuming steady, laminar flow, answer the following questions:

How many mass conservation equations do we need to solve?

a$.$only the one for CH$4$

b$.$ only for H$2$

c$.$only those for CH$4$ and H$2$O

d$.$we need to solve four mass conservation equations