How many molecules are present in 9g of water ?

Explanation

Molar mass of water `(H_(2)O)` = 18g
`therefore` According to mole-concept, number of molecules present in 18g of water = `6.022xx10^(23)`
`therefore` Number of molecules present in 9g of water
= `(6.022xx10^(23))/18xx9=3.011xx10^(23)`