Question

measure of number of entities present in a substance​

Answer 1

Answer:

The mole (abbreviated mol) is the SI measure of quantity of a “chemical entity,” such as atoms, electrons, or protons. It is defined as the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12. So, 1 mol contains 6.022×1023 elementary entities of the substance.

Explanation:

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Answer 2

Explanation:

1 mole of anything ( really anything ) has avagadro number of particles .

One mole of water weighs 18g so it 18g of water has avagadro number of molecules i.e., 6.022×10²³ molecules