Hydrofluoric acid (HF) can be manufactured by treating calcium fluoride (CaF2) with sulfuric acid (H2SO4) . A sample of fluorospar (the raw material) contains 75% by weight CaF2 and 25% inert (nonreacting) materials. The pure sulfuric acid used in the process is in 30% excess of that theoretically required. Most of the manufactured HF leaves the reaction chamber as a gas, but a solid cake is also removed from the reaction chamber that contains 5% of all the HF formed, plus CaSO4, inerts, and unreacted sulfuric acid. How many kilograms of cake are produced per 100 kg of fluorospar charged to the process?
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