1.

The mass of an atom of hydrogen is 1.008 u. What is the mass of 18 atoms of hydrogen.

Answer»

Mass of 1 atom of hydrogen = 1.008 u 

∴ Mass of 18 atoms of hydrogen = 18 × 1.008 

u = 18.144 u

∴ The mass of 18 atoms of hydrogen = 18.144 u



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