Which of the following is an empirical formula? a) H2O2 b) H2O c) C2H2 d) C4H8

Aluminum–lithium (al-li) alloys have been developed by the aircraft industry to reduce the weight and improve the performance of its aircraft. a commercial aircraft skin material having a density of 2.47 g/cm3 is desired. compute the concentration of li (in wt%) that is required.

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

An atom of lithium-7 has an equal number of(1) electrons and neutrons(2) electrons and protons(3) positrons and neutrons(4) positrons and protons