You are working with a concentrated solution of ammonium hydroxide which place of safety equipment is most important to have on hand

Aroom with dimensions 7.00m×8.00m×2.50m is to be filled with pure oxygen at 22.0∘c and 1.00 atm. the molar mass of oxygen is 32.0 g/mol. how many moles noxygen of oxygen are required to fill the room? what is the mass moxygen of this oxygen?

Which substance can be broken down by chemical means

Why is it that 85.48 rounded to two significant figures is 85 and not 86?