What is the correct form of the conversion factor needed to convert the number of moles of o2 to the number of moles of fe2o3 produced?

Apump contains 0.5 l of air at 203 kpa.you draw back on the piston of the pump, expanding the volume until the pressure reads 50.8 kpa. what is the new volume of the air pump

Chemistry worksheet - i am not sure what they are asking for exactly?

A5.00 g of a in . g of at aa 5.00 g of b in . g of .?at .