How many moles in 4.2 grams of NaCl

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

If 22.5 liters of oxygen reacted with excess of hydrogen, how many liters of water vapor could be produced?

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.