a a reactant a diffuses to a surface at which a reaction occurs accord
A. A reactant A diffuses to a surface, at which a reaction occurs according to the following
stoichiometry: A(g) → B(g) + C(g). Under what conditions can we ignore the convective
flux of A?
a. We cannot, because 2 moles of product gas (B+C) diffuse away from the surface for every
1 mole of reactant (4) that diffuses to the surface.
b. If the medium above the surface is quiescent and the concentration of A is dilute throughout
c. If the medium above the surface is quiescent and the concentration of both B and C are
dilute throughout the medium.
B. Why does convection not occur at a solid boundary?
a. No slip in normal direction and no penetration in the tangential direction.
b. No slip in tangential direction and no penetration in the normal direction.
c. Because the reactant becomes trapped in the pores of the surface and cannot pass through.
d. Both (b) and (c) are correct.
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