Bornite (cu3fes3) is a copper ore used in the production of copper. when heated, the following reaction occurs. 2 cu3fes3(s) + 7 o2(g) 6 cu(s) + 2 feo(s) + 6 so2(g) if 3.24 metric tons of bornite is reacted with excess o2 and the process has an 78.8% yield of copper, what mass of copper is produced?

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)