Calculate how many moles of NO2 form when each quantity of reactant completely reacts via the following reaction:
2N2O5(g)→4NO2(g)+O2(g)

2.73 kg N2O5
Express your answer using three significant figures.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?

Which of the following represents the ester functional group? a. -coo- b. -cho c. -cooh d. c=o

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize