An African game warden recently found several rhinoceros tusks. Because rhinos are endangered, all animals are tracked and the warden knows which animals live in the wild and which live in captivity. The warden suspected that poachers had stolen several captive rhinos and killed them for their tusks. The warden took the tusks with attached tissue for DNA analysis to determine if the rhinos were stolen from the preserve and if he could prosecute the poachers.

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.)