2 moles of gas exert a pressure of 2 atm. if some gas is pumped in, and only a total of 6 moles of gas results, what is the new pressure?

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

How many moles of bromine are needed to produce 3.23 moles of potassium bromide

I’m an electrically neutral atomic any element, there are equal numbers of