Answer :

Given: Mass of water = 90g

Gram molecular mass of H2O = 18g


To calculate the number of molecules, first we apply the formula:





Number of gram molecules = 5


Now, number of molecules = 5 × 6.022 × 1023


= 3.01 × 1024


Thus, number of molecules of 90 gm of water is 3.011 × 1024


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