Nitrobenzene C6H5NO2 (123.11 g / mol), is reduced to aniline C6H5NH2 (93.12 g / mol) with metalic tin. 3 Sn(s) + 2 C6H5NO2 + 12 H+ ⟶⟶ 2 C6H5NH2 + 4 H2O + 3 Sn4+ A 0.4978 gram sample of impure nitrobenzene was treated with 1.144 g of Sn (s). When reaction was complete the residual Sn (s) was collected and measured to weigh 0.538 grams. What is the percent of nitrobenzene in the sample?

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost