The uranium minerals found in nature must be refined and enriched in 235U before the uranium can be used as a fuel in nuclear reactors. One procedure for enriching uranium begins with the reaction of natural UO2 with HF to form UF4, which is then converted into UF6 by reaction with fluorine:
UO2 (g) + 4 HF (g) → UF4 (g) + 2H2O (l)
UF4 (g) + F2 (g) → UF6 (g)
a. How many kilograms of HF are needed to completely react with 2.25 kg of UO 2?
b. How much UF6 can be produced from 830 g of UO2?
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