Eli5 how one mole of any element or compound could have same no. of atoms or molecules??
In: Chemistry
That’s the definition of a mole. A mole is a set number of atoms (more specifically, 6.022×10^23).
Think about one dozen (12). A dozen doughnuts is 12 doughnuts and a dozen eggs is twelve eggs. They have different masses, weights, and volumes, etc. but a dozen is still 12.
Because that’s the *definition* of a mole. It’s “number of things”.
That’s like asking “how can 10 oranges be the same number of fruits as 10 apples”
Because that’s how a mole is defined. One mole is equal to 6.02214179×10^23 atoms, or other elementary units such as molecules. Whatever substance you are dealing with a mole of it is always the same number of atoms/molecules.
In addition to the answers given, that’s why it’s a useful parameter. Because it is the same number of atoms it means that you can use it to measure how much of two substances react together. If you have substances A and B in a 1-to-1 reaction then you know you need 1 mole of B to react with 1 mole of A. Write up a report and say you took 10 g of A and 15g of B and it means little to the reader without working out the molecular weights. Write that you took 0.5 mole of A and 2 mole of B and the reader can immediately see you have a fourfold excess in the reaction.
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