grade 11 chemistry

Question

In chemistry the concept of the mole plays a central role. Explain why the mole, and not mass, is used to ultimately make calculations in stoichiometry.

Answer

First lets explain the terms used in the question:Stoichiometry: The relating of one chemical substance with another to obtain a desired quantitative data using a chemical reaction is called stoichiometry.Mole: A mole (mol) is a number of items equal to the number of atoms in exactly 12 g of carbon-12. Experimental measurements have determined that this number is very large:
1 mol = 6.02214179 × 1023 itemsIt is just like the unit "dozen" which means a certain number of items (12). Also, a mole of a substance has the same mass in grams as one unit (atom or molecules) has in atomic mass units thus it represents the link between number of atoms or molecules and their mass.Now since chemical reactions are balanced in terms of moles and not mass hence we have to convert the mass into moles and then carry out calculations.Please rate this question as per your satisfaction, would be of great help. Thank you.

Answer

I gave the full explanation why we are considering mole not mass. Because each rxn follows a stoichiometric ratio because mass is not equal after balancing It will be equal mass. For balancing you need mole. Because there are so many atoms are there. So you have to consider mole or Avagadros number etc. I uploaded as a Pdf. Hope you will be satisfied

Answer

Although mass is needed to do stoichiometry since in chemistry we count by weighing (mass) just as a way of counting coins can be done by weighing if you know the mass of one coin and all have the same mass, it is mole that states how many of each reactant reacts exactly with one another and how many of each product is formed. So mole concept is used since it tells us how many, the mole constant which is based on its mass. It is just as if you say, I dozen of x reacts with 2 dozens of y, in chemistry we use mole instead since it is only way how it could be detected by weighing (mass). A dozen is 'weightless' in a measuring instrument.

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grade 11 chemistry

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