Benzene, a chemical used in the manufacture of many products, has a
density of 0.8765 g/cm3. What would be the mass in mg of benzene if the
volume is 0.342 mL?
A. 89.9 mg
B. 390 mg
C. 2560 mg
D. 3340 mg
E. 300 mg

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.)