Eli5 how one mole of any element or compound could have same no. of atoms or molecules??

Question

Eli5 how one mole of any element or compound could have same no. of atoms or molecules??

In: Chemistry

Answer 1

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.