Question

what is mole concept ;,calculate tha number of molecules in 45g of water

Answer 1

A mole (symbol mol) is defined as the amount of substance that contains as many atoms, molecules, ions, electrons or any other elementary entities as there are carbon atoms in exactly 12 gm of . The number of atoms in 12 gm of is called Avogadro's number .
Molar mass of H2O = 2+16 = 18g. Moles = Given mass/Molar mass. = 45/18 = 2.5moles. No of molecule in 1 mole = 6.022*10²³

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