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Spherical particles of zinc blende of size R=1 mm are roasted in an 8 % oxygen stream at 900^∘ C and 1 atm. The stoichiometry of the reaction is 2 ZnS 3 O2 →2 ZnO 2 SO2 Assuming that reaction proceeds by the shrinking-core model calculate the time needed for complete conversion of a particle and the relative resistance of ash layer diffusion during this operation. Data Density of solid, ρB=4.13 gm / cm^3=0.0425 mol / cm^3 Reaction rate constant, k^''=2 cm / sec For gases in the ZnO layer, 𝒟e=0.