¿Cuántos gramos de sulfuro de plomo(II) se usan para producir 128 g de óxido de plomo(II)?

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

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?