1.

Calculate the mulecular mass of CH3OH, C2H4, NaOH(C-12, H-1,0-16, Na-23​

Answer»

-Given compounds are CH₃OH , C₂H₄ and NaOH TO FIND :-Molecular mass of the Given elementsSOLUTION :-(1) CH₃OH Molecular mass of CH₃OH = Mass of Carbon + 3( Mass of Hydrogen ) + Mass of Oxygen + Mass of Hydrogen = 12 + 3(1) + 16 + 1 = 12 + 3 + 17= 15 + 17 = 32 ∴ The molecular mass of CH₃OH is 32(2) C₂H₄Molecular mass of C₂H₄ = 2( Mass of carbon) + 4(Mass of hydrogen) = 2(12) + 4(1) = 24 + 4 = 28∴ The molecular mass of C₂H₄ is 28 (3) NaOHMolecular mass of NaOH = Mass of Sodium + Mass of Oxygen + Mass of hydrogen = 23 + 16 + 1 = 40 ∴ The molecular mass of NaOH is 40NOTE :- Molecular Mass is the sum of the MASSES of INDIVIDUAL atoms present in the compound (or) the total mass of the compound is DEFINED as Molecular Mass.



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