Under certain conditions, natural gas (methane, CH4) will react with a limited supply of oxygen to yield a mixture of soot (C(s)), carbon monoxide, and water, but no other products. This is commonly known as incomplete combustion. If the number of carbon monoxide molecules that are produced is always twice that of the number of carbon atoms in the soot that forms, how many oxygen molecules react with 9 molecules of methane

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.)