What is the SI unit that refers to the amount of a substance?

What is i fracture in the crust called when land move up, down or sideways

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Butane gas reacts with oxygen gas to give carbon dioxide gas and water vapor (gas). if you mix butane and oxygen in the correct stoichiometric ratio, and if the total pressure of the mixture is 390 mmhg, what is the pressure (in mmhg) of water vapor after the reaction is completed (temperature and volume do not change).