"A compound contains only C, H, and N. Combustion of 35.0 mg of the comound produces 33.5 mg CO2 and 41.1 mg H2O. What is the empirical formula of the compound?"

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