How many molecules are in 5.60 L of oxygen gas

5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.

air quality

poor drinking water

and heavy polution

can lead to poor health

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.