Copper as CuO can be obtained from an ore called Covellite which is composed of CuS and gange (inert solids). Only part of the CuS is oxidized with air to CuO. The gases leaving the roasting process analyze SO2 (7.2%), O2 (8.1%), and N2 (84.7%). Unfortunately, the method of gas analysis could not detect SO3 in the exit gas, but SO3 is known to exist.
Calculate the percent of the sulfur in the part of the CuS that reacts that forms SO3. Hint: You can consider the unreacted CuS as a compound that comes in and out of the process untouched and thus is isolated from the process and can be ignored.
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