How can using moles be useful in doing calculations in stoichiometry? At least two reasons?
Answer:
a)1 mole=6.023*10^23(avogadro number)
using such a big number would be a difficult task
thus mole is used to identify this number of atoms or molecules
b) use of mole concept in stoichiometry gives bigger or positive numbers which are easier to handle
-A mole is a sum of particles. It represents a very large number (6.02*10^23). Deaaling with a benchmark value like a mole is much easier than dealing with a huge number of something.
-It's convenient for equations. Balanced equations with stoichiometric coefficients can automatically be taken in moles. This makes it easy to perform calculations involving values that must go through a reaction equation to get a final answer.
-Moles are in everything. Almost anything in chemistry deals with moles. They are used in countless equations and conversions.
I think its because a mol represents the real mass of determinated chemical compound or element, based on the principia the matter isnt destroyed when a chemical reaction occurs, just is transformed, then the values of moles give us the exact quantity of a compound that reacts and appears in other compounds. for example:
when you have the following reaction:
2H2 + O2 ----- 2H2O
you see you need 2 moles of hydrogen and one mol of oxygen to complete the reaction, then you now have 2 moles of water
you can see clearly that you need to analize the structure of each compond to make the stoichiometric calculus, and finalli if you transforms all the moles to grams, you will know exactly how much compound youn need to start the formation of water and how much of water you will have at the end of the reaction, finally you see the importance of the moles.
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