Which formula equation shOws a reversible reaction? O 2Na + F, → 2NaF
O CaCO, → CaO+ CO,
O NH, Cl(s) → NH,(g) + HCIg)
O 2H, O,(ag) →2H, O) + O, (e)

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answerapplication program;

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.