# Deduce the number of molecules of the compound H2O in 90gm

We have given:

Number of moles = Given mass/Molar mass

Given mass = 90g

Molar mass = 18g

Therefore, number of moles = 90/18 = 5

Number of moles

Number of particles = Number of moles × Avogadro number

Number of particles = 5 x 6.022 x 1023

= 30.11 x 1023 molecules

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