Deduce the number of molecules of the compound H2O in 90gm
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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/Avogadro number
Number of particles = Number of moles × Avogadro number
Number of particles = 5×6.022×10²³
= 30.11×10²³ molecules
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